Rivals System:
Add a page on Star Maker that has top creators, when you get invited to Starcon you reach the bottom of the ranking and can climb your way up. At StarCon you can go meet other creators, and get a collab with them by either seducing the women kind of like Chloe, or beating their manager kind of like the Tristan interactions. They can later be invited to the studio for collaborations or just met every so often at starcon.
Computer Overhaul:
Turn the starmaker app into either a desktop app or a tab in a browser, from there you can access more tabs like, settings that will allow you to choose preferential features, or a messaging app that will allow those you've seduced to send you sexy photos, or in Adrians case if he moves to japan he could tell you about his travels and send pics of girls hes been meeting. This could also be where the gallery is accessed, and if you did desktop apps could hide it in a folder called homework or something.