Up until 2017 or so, you could see the Elixir community active on StackOverflow with answers from José, Chris and most maintainers. Then the community collectively moved to Elixir Forum. Wouldn’t you prefer to ask questions where the maintainers can also answer? Per the Elixir Forum stats, the number of active users keep growing.

I won’t comment on TIOBE because you can find plenty of critique elsewhere. For example, in the Redmonk rank, Elixir does fairly well on the GitHub axis, and is ahead of contemporaries like Clojure and Julia, and ahead of other functional languages like Haskell, Ocaml, Erlang, and even F#.

I strongly believe Elixir is before its peak. Elixir is most likely still growing, just not at the same pace as languages like Rust or Kotlin.