Now I have accumulated a small amount to be able to reopen a bank account but I think that instead of opening a new bank account, it is be better to just buy and invest in bitcoin so that I can expect more profit than the traditional bank.
Who knows if this may be the best decision you ever made but in my opinion it is.
You still need bank accounts though just for a different purpose because you might need it someday. Then, save some cash instead of putting it all in one basket in BTC or in bank.
Diversify. I think wise people scatter all their assets at some point to have an option where they would pull their money whenever they are outside or inside the house. Just be careful with the volatility especially if you are in the trading business.
His choice was rather excellent that despite in times of pandemic last year, with a right mindset, he actually made the right choice to invest his remaining saving in his bank other than buying essential needs. Now the OP must've had enough savings and profits already than in the time of his writing.
It's totally fine to open a bank to put some savings but don't put too much to avoid unneccesary questions, because in times that you might want to go to another countries you can't really carry huge cash so in that way banks really helps a lot.