As I explore new things I haven't done in the game, I realized I have to do it to discover how to increase my asset. I spent 200k starbits and bought 24 packs. I didn't get any epic or legendary but it's okay. Next, I spent my 300k starbits on the Music Promoter and got 0.67 starpro. Now, I'm doing promotion fan club mission to get fan clubs and do record signing mission. Hopefully I'll get legendary card so I can increase my asset a bit.
Have a great day!