That's very unfortunate and sorry for your losses. There's no way to trade safely in crypto if first of all you don't know what you do. You should have a game plan before proceeding with such coins you are about to buy.

Set your limits, buy orders and sell orders. It's about the discipline that you will apply while being patient waiting for your trades to profit. Also avoid such coins that are just obviously pumps and dumps. The unstoppable and most advise of all, invest what you only afford to lose.

If trading didn't worked, its best to stop and just buy to hold.