Setting up a custom map server do's and don'ts

Hi all, I'm trying to setup a custom map server for a field tracking service. I have used the below setup to host one.

https://hub.docker.com/r/overv/openstreetmap-tile-server/

However, I'm trying to optimize this to run in a low cost hardware and specifically only rendering Asia maps. I'm successful till this but would still appreciate some help on making it performant/optimizing this.

Also, I'm trying to add a bunch of layers (similar to mapbox) on top of the base map and looking for open source solutions for it. Ideally all of them should be run in an offline setup, so can't have any dependencies over the internet.