If you live in China, you must understand that you have no chance to invest in BTC. China government bans crypto, it is including BTC for sure. If you force yourself to invest in BTC, you will get a trouble with the law if the government knows it. So, it is not a wise decision to invest in something illegal in your country.

Anyway, BTC investment has no guarantee for profits and it is always a high risk investment. If you expect for an exact profit and it should be in the short time holding, BTC isn't the right option. People mostly invest in BTC for a long term holding, but they never set an exact profit although they set a target. Regarding the time for entry (buy), surely it is not too late. We are still in the bearish period, it is always a good time to buy whenever there is a big dump.

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>>: https://worldcoin.org/articles/china-crypto-ban

Unfortunately, the answer to OP's question is no. Aside from being banned in China,
the guarantee of high profits is not on the table. Should look for other options to find the money.
I think the OP is thinking that he can get at least 10x of his 3k USD if he will invest in btc.
It means, btc going up at least to 90k, which we know is not the case here,

The tale of your brother is quite touching and inasmuch I would like for you to have the cash inorder for the transplant to hold, buying BTC with what you have now, with hopes of gaining double the capital, is not plausible. Unless you buy altcoins and trade, still it won't earn up to the $75,000 you require.

To best bet would be to invest in a physical business that offers service, like making deliveries, airBnb, or any other service business that is a daily necessity to everyone.

Sorry about your brother, but your only option now is to take out a loan or seek assistance from charitable organisations. Don't throw away what little you have left in haste because of your brother's circumstances and expect a large return in a short period of time. You were unaware of what bitcoin comprises and how it works, which is why bitcoin was the first thing that came to mind when considering where to invest your money. Bitcoin will fix your situation, but not in this short period of time when you needed the money the most. I wish you a quick pathway to find solution to your brothers health, family indeed matters always.

So sorry about bro and hope he recovers soon enough but please don't make the mistake most newbie do when trying to invest because they all see bitcoin as some kind of get rich scheme that would fetch them lots of profit over night after investing well for your case its a little bit different as yours would have been categories under desperation and a desperate can do anything thinking the results would be positive and its good you made enquiries before investing because lack of knowledge toward your plan could end up being a dangerous and destructive plan and that would have been the case for you.

Thanks so much for your advice, I wouldn't think of btc until there is no way out, China also has organizations similar to the gofundme, We raised $20,000 before the bone marrow pairing, China has a very large population, And countless patients similar to ours every day, You can't raise all the treatment, We went to Beijing for medical treatment, I quit my job to take care of my younger brother, But leukemia is not a free disease in China, Only the types of hypertension can be reimbursed, And they also need to be paid for the insurance by the company every month, My younger brother is only seventeen years old, He is a student, Have not yet, As you have said, I have spoken to my friends and family, All the available channels were tried, $30,000, But they understand me very well, This is an interest-free loan, There are no time constraints available, My parents have a house, But in the countryside of China, Cannot mortgage sufficient funds, And they need a place to live, I own a house myself, Currently in the loan, To want a mortgage, Need two signatures from me and my wife, But my wife does not agree, My wife has asked me for a divorce several times, And I understand her very well, I don't want to say that China is bad, But in China, poor people with leukemia almost equals death, But I was my only younger brother, I grew up with him, He got very good grades, Great chance to get ahead. If I can choose now, I would like to replace my brother with leukemia. The above is all machine translation, considering the expression is not clear, sorry

First, I pray that your brother will get well soon but I believe that it would be impossible for you to increase your $3000 to $75k in a short span of time just by investing only.  If you have the talent for trading, sure there is a chance for you to raise $75k from $3k capital but if your plan is through holding and selling at a higher price, then it will take you years or even more than a decade to get the $75k target selling price.

It is not too late to buy BTC but you will be disappointed if you don't meet $75k profit with your $3k capital by just buying and holding in just a short span of time.

What exactly do you mean use your life? Are you doing bad things? If this is the case, it will never be a good decision. Your brother will be upset if the money you received was obtained illegally. There is always a solution to fix an unsolvable issue in a good way. You can utilize social media in any case to inform them of what happened to your brother. There are many wealthy people in the world, and I believe they have always wished to help. It's true in our country; if there's a problem that requires a lot of money to address, they reach out to people on social media, and I see some comments from individuals who want to help.

That's the best thing you can do especially if you can't get any help with your relatives and friends.

I am very sorry for the situation your brother is going through and of course also for what you are going through, it is not easy when such a close relative has to experience something as strong as cancer…. but unfortunately if you start investing in bitcoin right now in order to immediately help him financially, you would waste your time, since it could be considered a bit late, the way in which this asset works is not the same as the way you are thinking, because it takes time to give prosperous results and thus increase those assets that you currently have, so you should go looking for an alternative that can increase your money quickly. However, it would not be a bad idea to start investing now with the intention of insuring yourself for the future, so that you can face these events in a better way and not be caught off guard.

First of all my best wishes to God for your brother for a speedy recovery. As you have some money to spend on your brother's treatment. But if you take a step like investing bitcoins to get a quick profit from that money and treat your brother then it might be wrong. Because you won't get quick profits by investing in Bitcoin, you have to accept that it will take time to make a profit. Since your brother's matter is a matter of life and death, you need to focus on your brother's treatment. And if you think you can invest some of your money in bitcoins and you will benefit from it in the future then you can do it. But you have to take care to treat your brother from the money you have and keep him healthy. If you don't have enough money for treatment now then give normal treatment so that you can earn money in future and pay higher treatment again.