What's the Best Programming Language to Learn for Career Growth?

I'm a software engineer with six years of experience primarily working with Kotlin and TypeScript. My focus has been on product engineering, where I prioritize simple, effective code that delivers value quickly. Recently, I've found some time to brush up on the basics and perhaps learn some new skills, like math. I'm curious if there's a programming language that stands out as particularly beneficial for someone in my position. I want to exclude languages like C and C++ since I'm looking for something that would be more applicable to my career. Any suggestions?