as long as you think the price will go up then enter, but thats where cost averaging come into play because no one should just go all in at one price point. thats how you can get a losing spread really quick. $7800 is the benchmark right now for a positive sentiment, and its not just BTC im talking about, if BTC crosses $7800 it means a lot of good things for other coins too.
Disclaimer:merely my opinions trade at your own risk