I'm pretty frustrated lately, I've got one client and looking to replace them or at least fill my pipeline with higher paying ones and back burner the other cli

I'm pretty frustrated lately, I've got one client and looking to replace them or at least fill my pipeline with higher paying ones and back burner the other client unless we can renegotiate rates (current is $40/hr -- all parties live in USA), I would kill for a $100/hr contract, but I have no clue how to land/pitch one. My primary stack: Laravel / Vue, though I've been playing with node (Feathers/express backends) as well a lot lately. I've also been playing around w/ react quite a bit. I think if I had $100/hr I could put more in the bank... this feast/famine cycle is killing my sanity.