This is really good for AI, but needs more to it.
Slower progress to getting to higher studio levels such as A, AA, AAA and such, while also have a prestige system with upgrades.
Needs more base upgrades, and the ability to level up upgrades.
A "Retire Franchise" option so you can create new ones without the list becoming too long.
Remove the cap on Fans gained per release, and instead of freelance for idle income, it could be "Merchandising" based on Fans
Theres really a whole lot you can do with this as a base, and I look forward to see if you go further with it.