Personally I moved to Scala, which has a poor reputation because of some symbol-heavy libraries, but you can use it to write very clean Python-like code. Version 3 has actually added a more Python-inspired syntax with colons and indentation instead of braces.

Standard ML was where I started. As a language it's great, as an ecosystem it's limited. OCaml seems to be where the action is (and even then its packaging/dependency management isn't great - but then it can't be worse than Python's).

F# has a very good reputation but I haven't used it a lot myself.