Let’s talk graphics for a second graphics should be made so you can pick or choose your quality or just increase the graphics for everyone or make them the same .
What phone do you use?
It could be that you use an uncommon brand so the game doesn’t recognize it’s hardware, so it lowers your graphics cause it thinks you use a low end phone.
You have a old phone with old hardware so you can’t play at ultra, this is because to reduce lag
You probably have one of those low end phones or iPad or whatever. I had a tablet that can barely get frames in this game even on its one graphics setting. The graphics option didn’t exist on that tablet; I’m glad we traded that thing in - it was lag-filled on any app I used on it.