December 2017 during the high of highs, I made a huge mistake, I allowed greed and fomo, ignored my gut and bought into NXT because I was chasing Ignis airdrop. The coin has since tanked and I still have not received the airdrop. Nxt is probably 80/90 down.
What is your biggest cryptocurrency mistake???
the top time for Alts were early/mid January. Not quitting crypto at these prices was really big mistake for almost all crypto guys

Hopefully we'll see better prices in late 19/early 20...