Developing and Programming an Efficient Network Architecture

TLDR; Looking for more efficient ideas on my Network Architecture, I'd like to keep the part that is not a WIP for my Network Architecture if possible, and there are code questions down below in bullet point form.

I'm looking for some further insight on the ideas I came up with for handling an expandable user-base at an affordable cost.

I recently made a post where I asked a few...

Developing and Programming an Efficient Network Architecture