Suggestion on Career Advice

I'm currently learning React.js and building small projects to strengthen my fundamentals. From this stage, what would be the right next steps to grow further in web application development? (e.g., backend, full-stack, or advanced React concepts), I'd also like to understand the earning potential in this field as a career. What skills or milestones do you think contribute the most towards improving one's earning capacity? Your suggestions and advice would mean a lot and help me navigate the right direction. Thank you for your time and for sharing your experience with people like me.