I bought a bunch BTC when it was $17000, then bought a bunch when it is $14000...then the price dropped until 2 days ago. I bought a bunch again when it was 6000ish...haha, now the price went up...so, really, when is it a good time to buy? When it dropped for a while and it rose a little bit, then drop again, then buy?
I think that is when the whole market red. This would be the best time to buy bitcoin or other altcoins. But to predict the future of a coin depends on a lot of different factors. You need to look at their ideas, staff and founders. You can view their information on the member referral board, from which you will draw a conclusion. Be careful when dealing. If you make mistakes, you will lose a lot.