probably best suited in the general section.

Anyway, best way to level up fast, just make sure you do all events every day, as well as do them as efficient as possible. If you feel like using ingots, you c*so refill your stamina.
At the same time, you want to push ninja exams as high as possible and maximize your 9tails invasion damage.

Don't forget to buy the jonin star, grants you extra XP