I love Ruby more than any other language I’ve played with, but it just doesn’t have market share and I need to pay the bills. I moved to Python; closer to Ruby than Go or JS, and a lot of market share. You have a Rails background, are you open to growing your skills outside of that niche? Python is everywhere; web, data science, security, AI, etc…etc…etc…
If you really want to stay in the web frontend space, JS/Typescript end to end is one option. Another is to do Go or Python with some JS support like Bootstrap, but I’ve seen talk that many JS framework people are going back to pure JS, maybe with something else (Go, Python) in the backend.
Not sure of your cloud skills, but I’d recommend AWS and move in that direction as well. With AWS Lambda you can skip the server and build a nicely automated workflow.
I’ve migrated my career multiple times, so let me encourage you: it can be done! Find what you love, do it very well, and you can beat challenges over the head, with enthusiasm.