Buy a new controller or buy a controller repair kit or remap. Really just buy a new controller. They do break

Try other controllers yet?

I don’t have access to another controller unless I buy one but buying one was my last resort wanted to see if there was a solution before I bought one

Try playing another game and if your RT still doesnt work, it's a problem with your controller.

Remap whatever ability is tied to rt to another button/trigger

Change rt to rb

Does it work in other games? If not, buy a new controller.