Do you have any income now? If not, maybe you qualify for Medicaid? It’s not great, but it’s cheap and better than nothing. If you don’t want that and would rather pay for better coverage (but that isn’t ACA qualifying for penalty avoidance purposes), there are some temporary health insurance plans you can check out:
Obamacare - practical discussion - #95 by xerty
And if you get a job, maybe then you won’t qualify for Medicaid anymore, which will trigger a special enrollment period where you can get back into an ACA plan if you want.