Ok keep at it! It can take months to mob some areas properly. Be consistent and find time every day to work on it even if just a little bit.

Also examine things that can hold you back like the way you walk or run and how you are placing your feet when you are doing either. Don’t let the knees drift in to collapse the arch! Standing would be another one. Make sure you are creating an arch by gently externally rotating your legs when you stand.

Good luck!