ALWAYS keep some of everything.
thats the best advice anyone could give you. personally, for every coin i buy i sell one third of it as soon as it triples. that way i get my initial capital back then i can leave the other 2 thirds to moon or drop to zero, whatever happens ill be covered
If ever Oyster PRL will hit $10 I don't want to dump it all, I'm just kinda hold a lot of it while this token is always growing in price.
Hold as long as you can and if you need to sell some just for your personal needs or in emergency and that's what I do.