The biggest regret is that I sold about a dozen bitcoins in 2017
atleast you have sold yours . you dont know that many people regret because they havent sell thier coins at the year 2017 but instead they sell thier coins at 2018 - 2019 because of too much waiting and price didnt come back again on where it was last two years ago . by the way my crypto regret is that i havent join much airdrop on the year 2017 . i could have been a milionaire that time because majority of airdrops are still paying but after those times , airdrops dont pay much and most of them are scams only