These two are the most important parts of your posts based on my own experience with trading, you should not overplay your hands and keep trading an asset because it worked perfectly once or twice for you, you always should set a profit/loss limit for yourself in a day/week that if reached you should cut losses/take profit and move on from that trade.

Also don't ever get on a trade with your full capital no matter how much you think it's a very good opportunity, for instance if you have $1000 to trade with, buy only $50 worth of that token/coin, that way you can start dollar cost averaging if it kept going down and get a better entry price and eventually be able to get out from that trade with profit or at the very least on break even.