Khan academy is solid for everything, but especially pre alg and alg.
after that try to get a syllabus from a 4 year math program and just start knocking stuff out one topic at a time. Try and learn however works for you. Cards, notes, videos, etc.
after alg id suggest basic geometry and trigonometry. Then some Precalculus. Then Calculus (sometimes split into parts, i did 3 parts). After that you can start exploring more conceptual math, but you’ll probably be in a program by this point lol
Also if you do courses eventually, make sure you use professor office hours to discuss things more in detail or get feedback on work. This was a huge resource I underestimated when I was getting my degree. Sometimes you have to even assert yourself because professors can be lazy. lol
Best of luck friend, hope you get hooked!