What I find out the best time to buy, is when bitcoin loses more than 25%-35% , its hard for bitcoin to lose more, and a bounce usually occurs without going much lower, that's about the best time to buy, but one doesn't know when that happens, but if it does, Its easy to spot. 2800 to 1800 , 3000 to 1800, 5000 to 3000, know the low support lines , right now low support is 3000ish and highest is 4160.