I am a new player and I am currently a tier 4 miner. I have a few questions about the most effectiveness ways to make money and use my mats. (To sell or to build to gear by Location)

I currently am working out of of Steppe Cross and Bridge watch and using the locations around both to mine. However I also have a friend who works out of Carleton and I recently discovered A love for Fort Sterling.

My questions is sort of in what city should I focus my mining efforts? What city’s should I just sell all my ore and what city should I use to craft my gear? And Best place for my private island?

I also don’t mind having mining gear in multiple city’s for a change of scenery but is that viable? I understand different cities have different specialties and I would account for that.