I know very little about Rust and have quite honestly, not bothered with it at all. It definitely does not have the market penetration of C/C++ and hence not proven itself in the "real world". You can do anything and everything in C/C++(multi-paradigm language). I will get more "bang for my time" by upgrading my skills to C++17/20 from C++98 than i ever will studying Rust.

From a current industry/job pov, i think the following are the most important ones; C/C++, Python, Java, SQL, Javascript and C# (from MS ecosystem). They allow you to tackle different possible domains.

Also given the prevalence of distributed systems; Erlang/Elixir are good to learn.