Edit: Looks like I provided the same advice in your other thread. You’ll find that happens when you ask the same question.
If you are truly interested in math, vs. just being “ahead”, I would strongly suggest looking at math classes at AoPS and finding a local math circle/team.
As a start, AoPS’s titled classes are much more in-depth than similar HS classes - try Algebra or Pre-Calc there.
But I would suggest exploring the Number Theory and Counting and Probability courses to get a broader exposure to math topics.
I’d also suggest reading https://artofproblemsolving.com/news/articles/avoid-the-calculus-trap
My D has benefitted much, much more from AoPS and a local math circle taught by Masters students at a local college than her 2-year advanced high school math (where’s she’s missed exactly one homework, quiz, or test problem in each of the last 3 years).