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I am using Blender 2.91 with Windows 10. I am using the Cycles Rendering Engine on my GPU which is an RTX 2070.

I have a project that I'm working on that takes an incredibly long time to render. I am doing all of the obvious things to reduce render times (ex. lowing the sample rate, decreasing the number of light bounces, changing the tile size to 512px because I am using an RTX 2070 card, turning off reflective and refractive caustics, checking "render region," turning down the number of max subdivisions, etc...). Even with all of these time saving efforts, I can't get a frame to render in less than about 8 minutes which is way too long considering that I might need to render a 1000+ frame animation in this scene.

I noticed that the lengthiest process for rendering seems to be called "synchronizing object." There are a lot of objects in this scene with many different somewhat hi resolution textures. Is there a way to simply bake every object together to cut down on rendering time? Even if that's not possible is there any way to quickly sum all of the objects together of print them as a single mesh object or something to make rendering this scene less computationally expensive?

Also, Idk if this is relevant or not but my memory is peaking at over 21GB which seems crazy on account of my video card is only 8GB and my computer only has 16GB of RAM total.

Update
I deleted about half of the materials and render time is FANTASTICALLY short! It still looks great even with only half of the materials present. The only problem now is that I can't add additional textures. I am trying to change the color and material of the main door to a wood material but the door material won't change at all. It just keeps the material of the wall for some reason. Any thoughts on why this is happening? I've included the Blender file and and a screenshot.
enter image description here

Here is the Blender File.
https://drive.google.com/file/d/1ik7SoVbX7c1LiEyj1An1GKJiyRTOnoCk/view?usp=sharing

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    $\begingroup$ Duplicate your blend file, remove all textures then test. Unsubdivide all meshes then test. Upload blend file so we can help troubleshoot. $\endgroup$
    – Nascent Space
    Commented Jan 15, 2021 at 1:30
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    $\begingroup$ Great advice! I tried deleting all textures but I think I messed up because I just deleted about half of the materials, but that DRAMATICALLY reduced render times. Now it renders in incredible time with what looks like half of the textures/materials still present. I actually really like the file like this so I'm satisfied to keep it this way. The only thing now is that I'm trying to change the material for the big main doorway and for some reason nothing's working. I will upload the file and update my question. $\endgroup$
    – ChristianOConnor
    Commented Jan 15, 2021 at 3:34
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    $\begingroup$ Close to 2 million faces, high levels of subdivision surface modifiers, large textures 2K and 4k... all of that uses resources. You can adjust your ambitions to the computer power at your disposal and otpimize your scene, or you need to get the hardware that supports the complexity of the scene. Fast, Cheap or Quality. Choose any two. $\endgroup$
    – susu
    Commented Jan 15, 2021 at 3:55

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Close to 2 million faces, high levels of subdivision surface modifiers, large textures 2K and 4k... all of that uses resources from your computer and eventually you will run out of them.

Read: Why does Blender use so much memory for large textures?

Using 4k textures on something that will only be a few hundred pixels tall on the screen is wasteful.

Solutions:

You can adjust your ambitions to the computer power at your disposal and otpimize your scene, or you need to get the hardware that supports the complexity of the scene.

Fast, Cheap or Quality, Choose any two

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