(Optimization help needed) The backrooms

I have a released game, “The backrooms”. I need help making it preform better, at least 60 fps. I have a mobile port which requires the same thing here. I have yet to add more content to the game, due to preformance and storage space. I did most of the optimization techniques I know, such as frustrum culling, batching, removal of extra entities, texture compression, and draco compression. Is there anything else to improve my game?

Here is what it looks like:

Image of the door to a safe zone.

Image of the inner backrooms.

At a guess, the post-effects would probably be pretty costly for mobile. For good quality bloom you seem to render to Half-float framebuffers, which is not cheap.

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What are some ways to optimize it more, and make the gameplay more smooth?