How to buy Bitcoin? Since I see CEX like BN has quit, I'm really worried about trading in CEX.
There are lots of exchanges you can use to buy bitcoins and I think a lot of people have already told you where to buy bitcoins nowadays. Binance only has problems in a few places, but not all countries have problems buying or trading. In my country Binance is still freely used for now, but if you are one who is concerned about privacy, binance is not a solution to use.
Does anyone have suggestions? How to buy and where to buy, or is it the right time to trade?
Here you are again repeating how to buy and what exactly do you wan. Buy or trade? Because many people may have explained both, and you just have to choose according to what suits you best. If you mean trading then always pay attention to the level of security and the exchange is not a place to store bitcoins.