Is there more info on how fame is gained? What “actions” increase fame? Also is this only about Aliron, meaning if characters are performing duties elsewhere they will only lose fame due to time even if those actions would contribute to fame if they were in Aliron?

In general is there any explanation about it or should I just experiment?

Service gains fame up to t2 randomly 

Clearing dungeon gives fame up to t3 to 1-2 random characters of final group 

Crafting epic and legendary items give fame up to t3 and t4 

Winning arena gives up to t4 and subsequent win gives t5