I have transitioned my entire team (comprising people ranging from fresh-out-of-a-bootcamp to senior 20-years-in-the-web).

Next.js and GraphQL are interesting technologies, but I would say they will eventually fade. They do solve some problems, but they introduce new (hard to fix) ones.

Typescript is here to stay. The improvement it brings to the development experience cannot be understated.

It helps the inexperienced to avoid lots of (minor) bugs and providing much more useful autocompletion/inline docs than any javascript analyzer can.

For the experienced people, it is an invaluable tool when the time for largeish refactorings comes. For the first time you can "follow-the-trail-of-errors refactor" in frontend-land.