Do something to buff the snipers. That's what most players associate Garnet with; And from what I've heard is the main reason for their playing the server; As well as their leaving. Certainly don't return it to the dominating meta it was; But give some credence to what seemingly made Garnet such a popular server. At least considering how much of the playerbase has left. I would personally increase all the SMG/Rifle accuracy to near perfect; However that's just my optimal experience.
Perhaps look into altering the map in some way also(inb4 compile time, It's 90% brushes) Mosque is impossible without Cons control; With RU already having less players, it's difficult to allocate players to taking it, let alone actual willingness to strategize.
Powerplant is just a very strange objective, but I'm alright with it as it normally has few players attempting to cap.
I would also recommend attempting to remedy the Arch camping problem. I'd recommend limiting visibility to the archways, as to prevent being sniped from halfway across the map. With the US arch to Shipment being the biggest offender.
Shipment is a well made objective in my opinion; Though I'd like for solid cover in the actual warehouse.
I've just noticed that who I presume to be a gamemaster added a way to get over the fence blocking the RU entrance to Cons. Very positive change.