Did not make enough to qualify for the premium tax credits?

I’m in a weird situation. When I enrolled in my marketplace plan last year, I thought I would make enough money to hit the FPL and be eligible for the premium tax credits. Well, things fell through with my job and I have not made enough to meet the minimum FPL. Will I have to pay back those tax credits? Also, since it’s open enrollment time, can I reenroll for coverage next year? (I have another job now, so hopefully will meet the FPL minimum next year.) I’m in TN, so can’t get medicaid here.