Your objective should be to raise a single character to level 30. There is great meaning in accomplishing what is difficult. To find your answer, you must set your sights high.
Why not try fighting someone stronger than you in a Ranked Match? There's a lot you can gain from fighting stronger opponents. Beat 10 of 'em and you'll understand.
It's about time you cleared Survival Mode on normal difficulty. You know what happens if you refuse, don't you? Let's just say the only way you live is if you keep on winning!
So you wish to learn Yoga? If that is truly the case, then first you must complete the Character Story with all characters. There is great merit in walking each of their individual paths.
Achieved three consecutive victories in Ranked Matches, have you? It appears you are getting a handle on your power. Maintain your modesty, and focus on your training; the path ahead is long.