I guess you are on V-ray, right? Believe or not, but 3070RTX will NOT dramatically improve your viewport, especially in hard and heavy scenes....most because they have same amount of VRAM, and that is 8GB, which is pretty low for nowadays scenes.
I would suggest you to buy some used 1080Ti, with 12GB of VRAM, that will boost your scenes like rocket, or 2080Ti....
When it comes to graphics, amount of video RAM is much more import than the its speed, because once 3ds max loads textures and polygons, speed does not matter so much....
....so, upgrading to some 1080Ti, or 2080Ti, would be huge step for you, even you are working with so much proxies, and take care of optimizations....
Cheers!