Of all the usages you mentioned, I think the best one is to hold the Bitcoin for at least 4 years or if you can hold it more then that will be more beneficial for you. We can do transactions with paper currency but we can't use paper currency for investment purpose because value of paper currency decreases with time. The prime reason we must not sell our Bitcoin is because it has the potential to increase its value with time. Those who have invested in Bitcoin for long term, knows how profitable Bitcoin can be if handled properly.

Bitcoin investment is long-term, if managed properly, it creates a very high possibility that you can get a lot of good things from Bitcoin. However, the issue of holding Bitcoin is not easy, we find holding very easy, we can easily say that we are starting investment with the goal of holding Bitcoin for the next 6-8 years, but the issue of maintaining the investment for 8 years is not easy. Bitcoin has volatility but you have to maintain the investment through it, you may have to face various interesting problems, financial problems, but you have to continue investing through everything, which we can easily say, but when you go to do this, it will create a lot of pressure. And so you have to invest by maintaining financial management by taking care of your ability. Don't think about how much it will increase tomorrow by buying at today's price, but you have to buy continuously, no matter what the price is. In this way, those who can maintain investment with stability, will have the most chance of success.

That is a realistic price. Because what I have mostly seen is about $1M and higher which I think is doable but, we don't know how quick or slow it will be in the process.

In that time, there will few halvings left and the reduction of the reward for the miners will make it more difficult to mine it.

Which means, lesser supply to be mined and then the demand shall increase so, yes possibly $400k and a bit higher IMO.

New investors ought to learn about Bitcoin history. It is through the process of learning the history that they understand what action to take, when to take and what strategy to use. Learning about bitcoin starts with understanding the purpose of Satoshi. That way, newbies will understand the value of bitcoin.

The next thing to follow is to know how to secure it from the wavering scammers online. These scammers know that the newbies are the most vulnerable to attack. A newbie who is naïve will fall for scammer's new tricks.

After learning security, the next thing to learn is how to invest in or trade Bitcoin. The basic knowledge of investing is enough to take the investor far in his investment journey.