Scala might be what you're looking for. (Or Haskell, but that's a bigger leap). You can write code that looks like Python/Ruby (some libraries are quite symbol-heavy, but you don't have to use them; check out lihaoyi's libraries for some Python-inspired simple interfaces), but everything's fully typed. And it has an excellent JavaScript backend that integrates with typescript/definitelytyped for using web libraries.
If it's an old project, that's a given but the culture is changing and community is slowly accepting terseness and performance as key factors to consider when writing new code.
I think the main problem with C# is that even though you can write scripty “pythonic” C# since like 2010, people are still coding C# likes it’s early 2000s enterprise Java. The .NET library doesn’t help either, since it sets the “style guide” that many developers follow.
Pretty much all the new-ish language have less boiler plate than C#/Java. Kotlin and swift are somewhat good.