I have also been like you sometimes, selling all and thinking of buying deep which sometimes never happens....wrong idea.
I remember trading/owning 1 Sora when it was around the $50-70 by buying and selling it in that range.

I realized that I never bought it back after I kept trading it!!
It is now trading in the $450-600 price range just 6-8 months later!!!

We should never sell all of our coins hehe