Around 2018 a friend of mine bought some unit of Bitcoin equivalent to $1,000 and also advise me to do same but I refused and was skeptical about it because I was of the notion that "what is really moving is coin of a currency" fast-forward 4 years later my friends share or unit of Bitcoin skyrocketed to $10,000 and I was at thr losing end just to be left with the thought of had I know.
Have you searched for the truth because Bulgaria is actually not the country with the highest bitcoin. Almost many people here want bitcoin as a means of payment, but not all countries enforce that. Now we are no longer talking about payment instruments, but rather how we can take opportunities in Bitcoin to make a profit. I believe that bitcoin has found a wide market throughout the world despite resistance or bans from some other countries.
Your mistake was not trying to find out how Bitcoin was going at that time and you were too quick to decide to refuse to make the same investment as your friend. Now he has everything and if the concept is long term then I am sure your friend will have made quite the maximum profit from the initial investment process.