My biggest mistake is not seeing the renewal of the coins I have, I used to hold ULTRA coins and now the team has converted the coins to UOS, as you know, swap fees on the ethereum network are very expensive, so I can't do it for now.
my next experience is, lack of experience in investing, from several ICO projects that I participated, everything is a scam, it happened because the tokens I have are listed on Dex exchanges like etherdelta and forkdelta.
from here I get a lot of experience not to repeat the mistakes I've ever had.