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1. I always like the idea of " not selling everything ", assuming I have 1000 tokens I always sell 90% even when they are at ATH, leaving very few coins and tokens behind do have it's time, there will come a time where they add more value, remember not every ATH is the last ATH.
this point applies to me, for real coins and entered in the CMC Top 100, not for new coins, if it reaches a new ATH I usually sell 1/2 of my assets, because 1/2 of my assets already give 100% profit from buying that coin sure and I use it to look for other coins that haven't reached the new ATH