You can still purchase healthcare insurance through healthcare.gov, for up to 60 days after losing employer-supplied insurance, whether you were fired, or quit.

You can still purchase healthcare insurance through healthcare.gov, for up to 60 days after losing employer-supplied insurance, whether you were fired, or quit. Also, the enrollment period is extended through August last I checked due to COVID. So, basically you can just purchase your own after leaving, if you want. Or you can go COBRA, but that's hella expensive.