I’m sympathetic to both Clojure and Elixir (or Gleam), but for easing into FP then I’d start with F# (or ReScript), just because they are both in the OCaml family of languages (best in class for pragmatic typed FP), and because of everything Jesse Warden writes:

https://jessewarden.com/2021/01/in-search-of-the-best-functi...

F# in particular because of the established ecosystem and possibility to fall back to OOP if you need it, since it is multi-paradigm.

«JavaScript to ReScript» where he evaluates a lot of FP languages: https://youtu.be/dFHj1d9FG8M

NB: He’s all about static types though.