Polarisprog Pet System, More Pets Equip?

Hello, I watched polarisprog pet system vids and made a pet game with it.

In the system you only can equip 1 pet, I want that players can equip 4 pets at the same time, but I don’t know how.

I can’t change pet system, because I already made areas with coins and stuff, so it will take hours to change it. Maybe someone can help me with it. Here’s the playlist I watched: