Learn accessibility, learn to do it without the stupid framework, that way you can recognize how much the framework nonsense has saddled you up and taking you for a ride by teaching you bad habits and resulting in websites and interfaces that are a giant middle finger to user with accessibility needs, and how 80%+ of what you've done with the TRAIN WRECK of developer ineptitude has little business being done from JavaScript in the first place!
Seriously, if you think React is something to be used, you likely don't know enough about HTML, CSS, or JavaScript in the first place to be using it.