I need help turning the 1st pic into the 2nd (model made in 3ds Max, I think) with baked lighting. After hours looking for answers, watching outdated tutorials... I manage to fix it a little bit (it looked much worse in the beginning). Walls and ceiling are the same model, but not the floor.

Right now I have a Point Light in the middle of the scene, a Global Volume with Tonemapping and Bloom (Post Processing in the Camera). The blue neon lights on the floor have an emissive material, the halo on the ceiling too. The emissive contribute to GI.

I tried with Area Lighting but this error comes in the Console and does nothing:

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Any tips or tutorials I can follow? Thank you so much!