Another option is C#, it keeps getting active development, is the closest[0] in performance to pure unmanaged tier of languages and has tooling similar to Rust's cargo, isn't being abandoned any time soon (it's a core dependency of msft and seems to be increasing in amounts of promotion (finally!)), and has other industry players also working on it (like Unity).

[0] https://benchmarksgame-team.pages.debian.net/benchmarksgame/...