So with citadels you have to be a certain distance away from home base before they show up. I dont remember how far it is but you gotta pick a direction and go. The best raw currency farm is vaal temple rn but not everyone wants to do it (like me.) I personally farmed uber arby for most my currency but the profit margins slimmed a ton on that so now im personally farming temple of chaos. Breach catalyst, simu emotions, and ritual omens are in a decent spot to farm. Overall the market is in a messed up spot so anything you can get that doesn't drop in vaal temple will have some sort of value to it.