so far with my lvl, my favorite is record a demo. full energy to use, when its done i have exactly 40% to do a music lesson for 24 to 49 skill(cards), which is far more than ego gained. repeat :P gets me 252 xp, min. of 24 skill, and (on average) 900 to 1000 starbits every 4 hours and 20 minutes. extra skill will allow for nice fan increase later :D
!PIZZA
I have also a routine where I can get the most starbits and good utilization of energy. During reset, music production (i get min 80, which is good for the day) and then sb millionaire. Then spam the short mission and long mission for recovery.