> Best strategy for becoming a high paying/good software engineer would be to think of yourselves as problem solver and language as just one of the tool for problem solving.
I'm not sure becoming a high paying/good software engineer are necessarily relevant to the stated goals of the OP's question. There can be inherent reward in working with a set of less popular, well crafted tools. Yes you might grow faster as a professional by working with a group of industry best JS programmers, but working with a small team building in Elixir and moving fast without ever hitting a NaN can be a pretty rewarding experience.
I'm not sure becoming a high paying/good software engineer are necessarily relevant to the stated goals of the OP's question. There can be inherent reward in working with a set of less popular, well crafted tools. Yes you might grow faster as a professional by working with a group of industry best JS programmers, but working with a small team building in Elixir and moving fast without ever hitting a NaN can be a pretty rewarding experience.