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?
First of all what token are you referring to dude? you didn't mention what it was. But if you think you have an income at least and you are satisfied with that income, then sell it first if you are happy there. But if you're hesitant, it's better not to sell right now, it's just that simple. And if you're referring to Bitcoin, and you don't need that much money yet, it's better to hold on to it for a few more months and observe the current market movements.
Then what are you planning to do right now? do you have a token in your wallet? or do you have funds in your wallet but you don't have a token to keep it? it is better to buy first and think about what coins you will invest in.