My game is lagging on mobile

I am new to unity, creating my first 3D mobile game and I ran into some issues while testing it on weaker phones.
I know this is a really common problem but I’v tried a lot of techniques like occlusion culling and tried to set my application fps to 60, -1, I’v turned off the v-sync and a lot of other things.
In the code that I am working on, there are a lot of colliders, and collision detections, maybe that is what causing all of the lagging?

thanks for your help.

I am using unity 2019.1.9f

Need more information.

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What kind of info do you need? I can take a picture of the profiler if it will help.