cobra question

I am currently ~30, unemployed after recently getting a graduate degree, and have earned 15k earlier this year. I filled out a marketplace application by assuming 0 income for the rest of 2022 while I look for a job. However, it’s also certainly possible that I (1) get a job with significantly more income and earn for some months before Jan 2023 and (2) sell my condo and earn money from that before January 2023.

Although I didn’t realize this would happen, the healthcare.gov site forwarded my information to Ohio medicaid who approved me. I’m concerned that I could easily earn much more than the 18k yearly threshold for this program during this year. I’ve called Ohio Medicaid, and they’ve indicated that eligibility is based only on current monthly income. But I’ve read conflicting opinions on this on this subreddit.

So I’m worried that I shouldn’t actually be part of this program. I’d rather just pay for insurance out of savings and not worry about whether I’m estimating my income incorrectly or whether I’ve forgotten about some form of income that places me over the threshold. Is this something I need to worry about?

Currently, I plan to just sign up for COBRA and try to get Ohio Medicaid to just remove me. It’s 600 dollars a month though. Once I have gotten removed from Medicaid, can I go back to the marketplace and estimate my income for 2022 with a more optimistic calculation to get access to a marketplace plan?