It's great advice, that FOMO is dangerous! I've been holding BTC since around 2017 as well and been on the roller coaster ride too. I picked up a bunch of DOGE which I was really starting to lose faith in until Musk made it shoot up, that was a pleasant crypto surprise! But never invest more that you can afford to lose, because you can lose everything. There are just too many rug pull schemes out there and unsustainable projects with no utility to the tokens. Sorry you got burned so bad back in 2018, I think we all did!