Q: Help. New account but same pre installed apps

I have a new Apple account since we were mainly using my brother's to access ICloud, Apple Store, etc. Now, I switched from his account to my own Apple account. When I went to the App Store, all the installed apps I had in my brother's account was still there preinstalled in my phone.

I see this as an issue because some apps have data from my brother's account which I dont want. How do I get rid of this preinstalled apps on my phone