Any regrets from the past few years?

Does anyone have any regrets on specific CC purchases or use of certain exchanges? I'm looking at you Celsius.

I lost about $500 worth of BTC and ETH crypto on Celsius, a small amount compared to my overall CC holdings. I wish I had done more research on them, and not looked at just the APY. I don’t think I’ll see a dime of it.

Also ALGO and ADA tanked after I bought, wish I waited a little longer to buy or not bought at all. I tried to average down to no avail, but I’m still locked in though and getting rewards through their respective wallets and staking programs. Algorands governance rewards are fairly great, further helping my avgerage cost.

What are your regrets?