I don't spend a lot of time building services, but the last few I've done, I actually went straight to Rust. The downside is that it's quite slow to develop -- I probably don't have the knowledge that others do, but it seems that frameworks could really use some work. That said, I love that I can find and fix most my problems during development. Building a service in Python means I'm constantly fixing issues in production.
.NET is certainly better than Python, but I'm not very happy with the type system and the code organization versus my Rust projects.
You know, I tried F# like eight-ish years ago, and I loved it, but I couldn't break into doing it with enough regularity and depth that it made sense for me. I still do a decent amount of C# at work, and with my experience in Rust (algebraic data types, etc.), I imagine that F# would really help out a lot in our .NET code.
.NET is certainly better than Python, but I'm not very happy with the type system and the code organization versus my Rust projects.