'marketplace' can't determine the perfect time for you to either buy, sell or hodl, it is you that will make that decision after examining so many factors some of which is personal to you, we do not even know the coin you intend to hold or sell or buy, how can you then be given ideas, dyor, it is not too hard to do, after doing your own research you'll gather information, and if you are to ask questions about investment, it will be questions that other members can act upon and give you assitance on.