What are some ways I can make my credit score higher/better?

Hi everyone, good morning. I just saw my credit score was 670! Ugh! I have only 1 credit card right now that I am using, and I am paying off… I was wondering what are some different ways to make my credit higher and better?

Obviously paying off my credit card every month… But even if I do that, how long will it take for my credit to become fixed? Are there any others ways? Besides just paying it off on time?

Will it take a long time to get a better credit score? Or are there any quick ways (possibly) ?

Thank you everyone