It is beneficial to have the idea, as many members have mentioned here, that accumulation is key. A long-term approach, and I have learned this the hard way because I could have had more if I hadn't converted what I had kept for a long time into BTC. Now I'm making a deal with myself to continue accumulating.
Another important note is to have wallet security and make sure that you are using a wallet that you have the keys to, and better yet, it's a hardware wallet.
It's okay to make mistakes, and that's even better to learn from them, especially from others if possible, not on yourself.
Sometimes, we need to do it ourselves though to get the message / lesson straight..