All your regrets are realistic, and too many people surely do these things. Even I am also one of them who cheated many bitcoins too early because I was always feeling not good due to enough negativity, which was spread by many big influencers on social media, but good thing happened now I realize my mistakes and started my job again with better strategy because my mindset is changing and now I am having good confidence.

Learning from mistakes and bringing changes for a better future is always good because time is still with us. The Bitcoin price is still not as it's going to be happening in the future. I am sure people will have a new ATH with good changes, while many countries' and big institutes' engagement will also have a big positive impact on its value and potential.

Only now do I understand that Bitcoin is such a broad technology in terms of interests that it attracts people with extremely diverse interests. These include speculators who are only concerned with price movements, and they don't harm Bitcoin in any way. They merely create additional volatility and greater adoption.
Of course, Bitcoin is interesting as an asset with a limited supply, which is why its price rises (it also rises because many Bitcoins are lost, which, in theory, reduces overall circulation). Bitcoin is interesting as a means of payment and a system for transferring assets anywhere in the world that doesn't rely on intermediaries.

Truly, there are always opportunity to buy Bitcoin and one can continue to buy and own Bitcoin. But the OP was more concerned about those who are always procrastinating. I will buy tomorrow, I will buy today, making them not to won Bitcoin. And gradually, time is going, and according to him, they would look bad and see that there have been a lot of time wasted from not buying and investing into Bitcoin.

However, with the nature of Bitcoin, it becomes impossible for people not to invest into Bitcoin, but anyhow, there are still people who are boy interested in buying Bitcoin. They prefer something predictable and are sure they are getting something when they want it. We know Bitcoin don't operate like that. We can't predict Bitcoin, and so, I believe that characteristics of Bitcoin, it's volatility will keep some people away from investing. But those who love Bitcoin, and have not started investing, they will always see it as a great opportunity passing by.

Can you see how much Bitcoin was worth when you knew about Bitcoin and how much Bitcoin has improved today? If you can determine this difference, then you will definitely understand how beneficial and profitable it is to hold Bitcoin, if I had trusted Bitcoin when I entered Bitcoin, I would have been able to take the opportunity to profit the most now, but I have been holding Bitcoin for a long time but I have missed the opportunities in the past.
So now I regret why I cannot invest more in Bitcoin, I buy Bitcoin for the future with whatever money I have saved, excluding my family expenses. Because now I trust myself that I will be financially successful in the future, if I am deprived of Bitcoin investment, then it will not be possible for me to be financially successful in the future. So holding Bitcoin for a long time is the most important thing.

It’s very true that most people will look back later and regret that they didn’t make use of the opportunity properly when they had it. But we should remember that it’s not everyone that actually believes in bitcoin. In as much as your investment keeps growing from a different place, he may not regret that he didn’t buy bitcoin, even if the price reached a very high level.