Assuming I've made up my mind to hold on to a token for many years but after a year this token hit a new ATH what should I do as a newbie? Sell or not sell?
If you already have an altcoin that has improved and have found a new Ath then it is very good and the right choice is to sell it immediately. and I'm sure those altcoins will come back down in time. and if you still have faith in the altcoin then you can buy it back. so you can benefit from 2x trades. because many altcoins that have reached new ATH will fall back down and if the altcoins are good they will definitely rise again until they find new ATH again in the future. example bitcoin every year has a new ATH.