Gleam is cool but honestly for now the ecosystem is so much bigger in Elixir. And yes, you can use some libraries across and things like that, but then again you could also bring in the parts that you need from Gleam into Elixir and instead of vice versa. If you just want to learn a really cool language, I think Gleam is pretty cool. But if you want to learn a language that is more productive but still kind of cool, I would start really like here and then dip my toes into Gleam.