I decided to go for kotlin as my first language because I had ideas for a mobile app. I quickly learned that android dev isn’t the best starting point, and I’m not a fan of the lack of choice I have for editors with it. I only really know some basics, I used to know some javascript but forgot it
You could try Flutter with Dart: https://flutter.dev/
Dart is quite similar to Kotlin, and Flutter is Google’s attempt to provide a modern app development framework without all the weird legacy stuff.
I don’t have experience with it, I just know it’s the thing they’ve invested heavily in.
In general I’d avoid hopping between technologies too much (it’s the classic procrastination method we all fall into), but I do think it makes sense to try and find the most highly recommended tool when you’re starting out.
All things considered, I think this is the best answer for OP.