[x4nt]

Personally, I converted our in-house Flask app to a RoR application with View delegation to React. This was mostly to align the technology to the skills we currently have on the team, but I got a lot of experience in the process.

See if there is any room to convert your current Python applications to Ruby.

[y3k]

Where I work at the moment doesn't have a single Ruby application, and it's "corporate enough" that introduce one would be pretty hard-ish.

I can give it a shot with personal projects, but still I don't think it'd be enough experience.