I am so close to buying another pack with Starbits but in my last pack opening, I got a Jet Ski card which added 400 fans and that sort of messed up my Ego score.
So now that I am at level 43/44 I am going to do music lessons till I hit level 45. This will be good in two ways. First, I would have unlocked the Acoustic Tent mission. Second, the starbits earned per mission would have gone up.
With some luck, I should be able to hit level 45 either tomorrow or on Monday at the latest. Ego would be in the 10-12% range as well. Alternatively, I could do missions and earn some starbits but it would probably take until Wednesday or Thursday before I reach level 45. Way too long in my opinion.
If I were starting all over again, I would focus on lessons and making sure the ego was low until I grinded up to a high enough level and then from there do missions in a balanced sort of way.