There's lots of nonprofit orgs out there, reach out via email respectfully, show your resume, and ask if they're interested in adding a contributor to their blog (doesn't have to be a byline, can be anonymous). Try 5-8 nonprofits, definitely smaller and less popular, and see what they say. It's a constructive use of your time and may open the door to contracting work.
e.g.
https://www.shantibhavanchildren.org/blog/