Bitcoin isn't moving very much just now. Up a tiny bit and then down a tiny bit. Would this be very boring for people. This might not encourage more people to buy. I think the only way people buy is if it's going up and down more. Because then at least they will have half a chance of making a good profit.
I don't agree with you that Bitcoin price is not moving too much like it was before, what is happening right now is Bitcoin price struggle to move upward but the volatility is still there. And I don't think that it is a valid reason that prevents people to buy more Bitcoin because it is still a good time to buy knowing that it can grow up to $20000 or even more. Short term investor might hurt about this kind of movement but this is all normal, there are lots of FUD coming out every single day so what do you expect?
To answer other comments here, yes Bitcoin is designed to be a currency but we can't avoid the fact that it is also a good investment and people will take advantage of that.