Adventure Mobile Game (trying to optimize)

I am having difficulty optimizing with the universal rendering pipeline. The frame rates are better without it.
I am using a nexus 5 for testing and I am getting 9 to 15 fps and it will never go over 30. Others have reported that on newer phones it runs slower than 9 to 15. I am not certain why URP seems to be so much slower. I have tinkered with the quality settings, shadows.

you’ll have to excuse the crudeness of the start screen. (no camera) tap to start the game.

(android OS)

(ignore the fps in the video as that is just how it is on a pc)

You have consistent particles running clearly. Also, are you disabling all objects not in view of the camera?

Unity I think uses frustum culling by default.