Is it a good time to sell?
There is no correct answer, the market have its own way to move. Although there is someone who believe 100% to his strategy that will get a profit but he just have 70% a chance to get it. I mean, in the trading or investing field there is no absolute strategy, there will be a time for the market give you a profit and give you a loss.
Seem like you just new to crypto currency, right? It would be better to learn first this field before you start. Don't just come when bitcoin and all crypto currency price in the bull run market. And also, it is bad to depend on someone else suggestion, this thing will not make yoh stay long in the investment/trading field, yeah in any investment place as a whole.