Back-end
Rust for speed, memory efficiency, type safety - Axum/Actix both are very fast and efficient but I think that Axum leads on the benchmarks right now.
GO will give you a very nice balance in simplicity and performance - the standard lib is very good you will most probably not need any frameworks.
Java (old dog) - Quarkus framework actually can compete with GO on benchmarks which is impressive for Java. Spring, will always be widely used, it's not a rising star but I had to mention it because I have made so much money with it.
Front-end
NextJS/React - NextJS if you need server side rendering.
Astro - getting popular for content management, it supports react and other alternatives.
AI, Data-Science etc
Mojo - I don't know how trending it is but it supposed to kill python. The company that made it claim to be super fast and python compatible.
For my current projects I'm all in Rust + NextJS.