This has been the very common question, not the key question, especially for those people who had doubts or just heard about how profitable bitcoin is since a couple of years after it was introduced publicly.
I've been hearing and reading the same question over and over again everytime bitcoin made a huge pump with being the first one in 2016 and then it was followed by a long bearish market in 2018. Does bitcoin reached it's peak? Well, the answer to that is nobody knows, but one thing is for sure, as long as bitcoin remains high volatile, the possibility are always huge, plus if you look into the historical data, the price are obviously in an upward motion each and every year passed.