Clojure has been a perfect fit for my needs, very similar to what you describe, and neither Rails nor JS have been able to match that.
With Clojure/Clojurescript you get:
- sane, single lang for both backend and frontend (much more seamless than JS/node),
- REPL-Driven-Development - immediate feedback loop translating to huge productivity boost,
- a very refreshing approach to programming,
- access to both two largest ecosystems JVM, npm and of course clojure's own amazing libraries,
- vibrant and diverse community, converging people from all different programming backgrounds,
- much, much more.
Rails and Django are a bit tied to 2005ish MVC paradigm and while it's reliable and gets job done, it comes with compromises on flexibility and user experience - making it hard to be competitive in 2022 as a solo founder. Clojure on the other hand is known for empowering single/few developers to outcompete much larger teams.
Seriously, forget about Rails and Django and just focus on Clojure.