I completed a developer course(Antigravity) while still in Grade 11. What's next?

I'm currently in Grade 11 and spend most of my weekdays at school. Outside the classroom, I've been learning software development whenever I can. Today, I completed PW Skills' Antigravity for Developers program. It was a great learning experience, and I'm excited to keep building and improving. For developers who started coding early, what skill or project accelerated your growth the most?