I'm still looking around, but Owl is a frontrunner.

If the bigger runtime isn't a deal breaker, maybe look at Racket.

Racket has great documentation but unfortunately even its creatures have moved in to Rhombus which is a non lisp.

Not so sure anyone is using Rhombus besides the few people working on it.

That's always the case for new languages :-) Language adoption takes time.

Besides Rhombus is still in the integration phase

https://github.com/racket/rhombus/discussions/521

Have you tried Rhombus?

It feels like a lisp - just without the S-expression syntax.

Also, having Rhombus doesn't mean Racket is abandonned. Far from it. Rhombus is built on top of Racket - and has gained a few nifty features in the process.