Today i levelled up and now i hit lvl 54, just need one more lvl to start a new mission
If you want lvl up faster you just have to focus a little more on music lesson becauese every time you do it 120 xp (best xp lower energy cost 40% mission)
it helps also to control your ego if you buy more instruments of the same type you get more skill point
focus on cheapest cards with 50 or more luck and you will no more have problem with ego.
Just look at my numbers.
with skill at 21049
Have a nice game :)