If you bought coins last summer when the price was 200$ then the answer is yes.
You made profit more than %100 and you can safely sell all.
If you bought after 400$, then don't bother. wait for 600$ at least.
Solid holders even keep holding their coins even while they have bought far below $300 last year. It requires you to have very strong hands in order to not secure profits at this point. If it's a smart thing to wait with securing profits in this case is another thing. Only time will tell.