I don't have any specific criteria for buying. All I do is DCA. You could say that I look for long-term gains. The crypto market has faced some uncertain events for the past few years. For that reason, you can't really get better results on analysis unless you have created your own strategy and methods to analyze it. I still consider myself a newbie in the trading section, so creating a new method on my own is not the best idea for me. So I try to stay on the less risky path. Therefore I choose the DCA method. Still working well for me.

And for selling I would say until I reach my targeted price/profit. If the target is not reached, I make a small profit but at many different price points. That helps me minimize my losses.