Focus on principles and core language rather than stacks. Unless you are getting a job tomorrow, the stack will change by the time you hit the market.
Principles and core language are long-term skills. For example, you'd do better learning ES6 than learning another framework. You'd do well to learn some functional programming basics as further studies will probably still be focusing on OO. Go in knowing there is no One True Way and you'll come out a better programmer.
What you have learned with React is how to handle client-side MVC, that is how to have the app in the client side and just the data on the server. What you have learned with PHP is the other way: having the app on the server. Understand the difference between the two on a deeper level and you will be able to evaluate the next thing that comes along.
If you haven't already, learn how to write unit and integration tests; and set up a basic build with something like bitbucket pipelines or the many github options.
If you haven't already, build something and maintain it for a while. Doesn't matter what it is, make yourself a website or little application and keep it online for a couple of years. You'll be surprised what that teaches you, particularly if other people use or need it. Stuff like monitoring uptime, learning .htaccess and how to SSH into your server that local dev just won't teach you. If you're not keen to put stuff online, run a raspberry pi on your home network.
Mostly though, just keep having fun and making stuff :)