I've found myself doing a bit of side work for small non-profits, and they tend to use older CMSs for their sites. They also tend to not have anyone on staff who fully manages the website - it usually falls under whoever is in charge of marketing or development (in the non-profit sense). One non-profit in particular reached out to have me on a monthly retainer to just pop in to their WordPress site to make sure things are updated and there are no security issues. They also ask me to do some content updates if they're overwhelmed and not sure of the best way to do it. Time wise, I'll spend maybe 15-20 minutes a month going through their checklist of ToDos, and they send a small but consistent check each month.

Maybe you could use your experience in CMS automation and reach out to a few smaller non-profits/businesses to see if you might be able to get a similar situation going? It could be a win-win; you can pull a consistent amount every month, and it's a huge relief to the marketing coordinator to not have to deal with administration they're not comfortable with.