Myriad Realms Store Manager System (Harry Potter AU)

Ten years have passed since my rebirth in the United Kingdom in 1981. Initially, I thought I would use my future knowledge to become rich after being reborn in the past, achieving financial freedom before turning 30. But on my 11th birthday, within my mind emerged a ‘ding’ sound. “Myriad Realms Store has been activated" "store owner, please accept the first task.” Apparently, I was stepping into entirely new and unknown future. However, what the hell is with this Hogwarts Acceptance Letter in my mailbox?（°△°—） l