For me that:
* Web: Ruby (Rails), Python (Django), Golang (Revel)
* Desktop GUI: C++ (Qt)
* Embedded: C, C++
* Data Science(ish) Problems: Python
That probably covers 95% of my day job, consulting, and my startup - I deliver a ton of work. Rails my 90% go to for web, python is data science, C is performance. A notable mention is coffeescript/js and CSS for design, but with partials / templates in the web frameworks I don't really need things like React.
I think the problem you describe is a self created one. You don't need to use the latest tech, build micro services, upgrade them independently, and use frameworks that are well supported in what you know. Hasn't failed me yet.