Worth fixing my bass

Where are you located? Prices vary widely depending on location.

It really depends what's wrong with it. If the neck is bowed because it needs a setup, that's fairly inexpensive or done at home with a few tools and a little knowledge. It's the truss rod is broken, there it's likely not worth fixing.

Assuming it's a passive bass and the tone pot isn't working, that's a relatively easy and inexpensive fix as well.

 

Is the truss rod working? The pot is an easy fix, but the neck could be a problem. Try adjusting it. If it doesn't help, find yourself a new or used bass and carry on. Good luck.