Yeah I'm not sure what direction you're taking but the SPA can be just its own thing interacting with APIs or server-side rendered. Also your back end, I would recommend knowing MySQL or SQL in general so you have that under you.
But yeah ReactJS is good to know/has huge market share. I'm glad I picked it over Vue/Angular.
If you're looking for something else to learn, being able to setup a Node backend with auth is nice to have as well eg. using JWT. Then knowing general best practices about security eg. XSS/sql-injection.
But yeah... Depends what direction you're taken eg. strictly front end or both.
Anyway good luck.
Check out CSCareers the subreddit if you haven't already. That is more for school/compsci but can help with how to get jobs. And have a good GitHub/LinkedIn.