Have you considered building up through freelancing? Having a technical writer available would be a godsend for small startups who lack the time or discipline to document decisions or processes (or anything). I am certain you could find enough SaaS teams to support with a pitch of “I’ll speak with you for 2 hours and save you 2 days”.

At 10-15 hours per week you could do this at nights and weekends, and quickly test if you want this as a job.

In fact I have a lot of writing that needs to be done, mainly internal for capturing what the product does etc. no massive time pressures so could be done in spare time over few weeks. Feel free to reach out via email in the profile.