That's the downside. If you look at the monthly "who is hiring" posts here on HN, you rarely see Erlang jobs. Elixir shows up a bit more often but it's still uncommon.

Yeah, I've really enjoyed the jobs where I got to use Erlang, but there haven't been enough of them. Even Elixir is kind of scarce.

Only had one, a contract where I got to choose the implementation. Job was to simulate a bunch of sensors on a network and Erlang was perfect for that.