When is it time to leave your agency?

I’ve been signed to an agency for 4-6 months and have yet to receive a job from them. I am signed to an agency about 2hrs away from me - I initially thought being signed to an agency in a major metropolitan area would be more beneficial, but it seems that it’s harder to book jobs, compared to some of my model friends who are signed locally & book jobs all the time.

I have in my contract that if the agency I’m with cannot find me a job within 2 months, I am allowed to withdraw my contract with no penalty.

Should I stick it out for my full 2 year contract with them? Or start searching elsewhere?

And I do start looking elsewhere, should I wait to be signed to another agency first, before I cancel my contract?