My biggest mistake so far is to sell my bitcoin's when it was at $15k not knowing that will hit $19k but i have bought back from the $6k so its not that too bad because i gained more bitcoins buying at the bottom,lets hope that bitcoin will going to bull run again so that these altcoins will grow to whenever these bullruns happens it shows positive outcome for the altcoins.
What? You sold BTC almost 3 times higher than you bought and think it's a mistake? I wish I had that mistake, really
I wanted to sell some at 18k but I don't know why I kept holding. Now it's obvious that that growth was abnormal. Plus, I bought too many alts during the bull run. That was my mistake as well. Although, I haven't lost that much in the end in terms of BTC. They grew a lot at first but now I'm at the starting point, even lost a little.