Health coverage after losing my job: marketplace or Medicaid? (Boston)

My employer coverage ended at the end of the month and I am trying to work out what to do as a marketing coordinator. Thank you in advance. I think my income this year might qualify for a subsidy. How fast did coverage start?

A free navigator at a community health centre walked me through my options. It took an hour and saved me a lot of guessing.

Losing job-based coverage usually opens a special enrolment window, so check the deadline on the official marketplace site. I missed it by a day once and regretted it.