How Should I Explore Physics As A Highschooler

I'm a student who used to slack off in physics till 4 months ago. A lot changed in those months and now I want to seriously explore physics. Even though I used to slack off I was never "bad" at the subject either. Other than just learning from a school textbook according to the curriculum (which I already am), what else can I do? I would not like to only reply on YouTube since a lot of it is popular science that I used to consume A LOT. I have about 1.5 a day extra for this excluding physical activity studies food blah blah. What would you recommend for me?