Cryptocurrency is slowly taking over the world and some hotels are now accepting Bitcoin as means of payment and Bulgaria as a country owns the highest Bitcoin as a country.
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.
When Bitcoin first broke out there was a man Laszlo who exchanged $10,000 worth of Bitcoin for two Papa John's Pizza from Jeremy but fast-forward to today Jeremy can purchase a million pack of pizza worth $10000 and still have more BTC left for him .
Nevertheless me falling short of the first opportunity of buying Bitcoin I'm still hoping of an opportunity to present it self so I can get the little bit of Bitcoin to my custody and I also advise both my friends and enemies to buy as much cryptocurrency as they can because cryptocurrency is the currency of the future.
What makes the difference between you and your friend is just the level of the financial knowledge both of you hard, and not Bitcoin per se, this is because, if you have good financial knowledge, there are other assets aside from Bitcoin that you can put down $1000 for 4 years and gain cumulative $10,000+ net profits on the long run, alot of times we tend to focus so much on the end results without minding what the real lesson and how we gain the knowledge to sustain that said profits.
Since we are here and discussing Bitcoin, I am glad that you have realised your mistakes and known the opportunity you have missed, but that is not the end, what I advise you to do is to make sure to build a fundamental knowledge of Bitcoin and how best to smartly accumulate along the way, once again Good luck.