First, I will tell myself to stick to bitcoin and never get tempted to trust too good to be true altcoins as they're nothing but certainly a playground of crypto scammers. Diversifying is good but you can always diversify Bitcoin with other type of investments like stocks or real estate, and not that bitcoin mixed with altcoins.

Second is, do your own diligence to learn in all aspects. Learning does not need to stop when you are already in a higher rank or position, but make sure to learn every time from your actions and decisions so you won't keep repeating the same mistakes and still lose in the end.