If they aren’t offering full-time work why not find one or two other agencies to freelance for? I’m assuming you don’t have a non-compete in your contract… if you do you need to fix that.

This would put more money in your pocket and accelerate your learning. One of the other agencies might also hire you full-time eventually if that’s what you ultimate want.

And in the meantime, the current agency might land more clients. Any way you add it up it solves your immediate issue.