Invite a friend or guild member to group, switch difficulty, disband party. If they aren't doing anything important, ask them if they can stay grouped with you while you farm so you can keep resetting.
What I was doing when farming that was taking a shrine into COA then after farming porting to another dungeon, checking the main first room for chest then walking out the door putting me back at the shrine and then doing one loop of a treasure chest farm before taking the shrine back to COA... Basically farming 3 sets. It helped to break up the boredom and COA was always good to go when I got back to it.
Runs| Orc Nightblade • Chim-el Adabal| Dunmer Templar • M'air the Honest| Khajiit Templar Oddity| Altmer Sorceror • Drizlo| Orc DragonKnight • Lady Ra Gada| Redguard Sorceror Taste-of-Hist-Sap| Argonian Nightblade • War'den Peace| Khajiit Warden • Little Warden Annie Altmer Warden Ports with Blood| Breton Templar • Dirty-Old-Man| Dunmer DragonKnight • Eyes-of-the-Sun| Argonian DragonKnight Bleak Mystique| Nord Warden • Polychronopolous| Imperial Sorceror • Bullcrit| Khajiit Nightblade PC NA CP 1250+ and still a noob At Writs End - A place to complete master writs