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?
If you're smart and have experience with knowledge you don't need any time to buy. A great investor can manage everything doesn't matter where he invest he will 100% get profit. Bitcoin never make you loss. Every time is a great time in bitcoins. In every business you take step with carefully same with bitcoin you have to work with careful mind.