Before I level up I make sure that I win the league.... then the level is done and I can move up, if I am not ready to be promoted I just stay down and wait for my moment of truth... level 36 , 35 league wins (once I finished second in level 3 when I didnt have this goal set up in my mind)

Also there is no need to be in a hurry as I read on the forum once you reach top levels (above 40) its getting downhill big time....

Once I reach level 3 on trebles, I will leave the game, thats my goal ..... 4 more trebles left to be won

just have fun playing it , its only a game with the limits