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 regret is not taking profits when my coins mooned during last bull season but then again i do not blame myself much because i was very new in this market at that time so all this happens and no need to feel bad.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?