"I just wonder how frontend developers keep up with that pace."
Understand the principles behind these frameworks, see that they hit just some point between conflicting tradeoffs, understand problem domains and how they interact with these tradeoffs. It's not like jQuery is accomplishing something fundamentally different than React, it's just that they make wildly different design choices that have implications on composability, maintainability, etc.
After you've learned a few of these (and the principles they are built on top of), you'll understand that it's going to be pretty easy to learn the next 10 of them.
Understand the principles behind these frameworks, see that they hit just some point between conflicting tradeoffs, understand problem domains and how they interact with these tradeoffs. It's not like jQuery is accomplishing something fundamentally different than React, it's just that they make wildly different design choices that have implications on composability, maintainability, etc.
After you've learned a few of these (and the principles they are built on top of), you'll understand that it's going to be pretty easy to learn the next 10 of them.