Many people regret that they did not buy BTC while they first knew about it. For some, they did not sell BTC while they could. 
For me, I got MWC & HEX for free from airdrop to BTC HODLers, but dumped them before they peak. I could easily make 10x of my existing BTC, if I held them strong.
What is your Biggest Crypto Regret?
My biggest regrets was trading, started in wrong moment of cryptocurrency. I should start from now trade or hold whatever is it For me, I got MWC & HEX for free from airdrop to BTC HODLers, but dumped them before they peak. I could easily make 10x of my existing BTC, if I held them strong.
What is your Biggest Crypto Regret?