Even most experts can't answer this question because fud is one big factor that affects the market while causing market dump, as we have seen today. Yes the market is in blood and no one knows what will happen tomorrow, but if one want to buy into any altcoin, first thing is to make sure that such altcoin is one with great use case such that it will recover and last long term no matter how hard the market dumps. Secondly, if one also want to buy in, and after due diligence finds a particular coin worthwhile, it is wise buying at intervals, such that if the market dumps more, you add to your bag until you are satisfied, this approach helps users to accumulate their desired altcoins.