That means doing Higher level content and gradually moving to EE.
EE CITW flagging quests are EEasy.
Then work your way up towards doing EE Highroads and EE Gainthold. Even EH highroad and EH Gianthold are going to grant more CoV than 13 to18 your getting.
You've only got to readjust your goals.
No Need for EE gear I've evolved to Running exclusively EE and the majority of my gear is of the AH (not the ASAH) Running EE though you do get EE gear and you can use that as you acquire it.
I was running EH only and hitting around 3800 CoV a life mostly running Gianthold and Highroads.
This life I've started in on EE only and at ~lvl 27.5 I had 5200 CoV. I had all my Sagas set to EE for turn in at ETR to jump to level 22 but, I decided to do an ITR instead. So I took the Saga XP early Capped and am back in Heroics. Still with a surplus of CoV.
EE rusted blades & EE Impossible Demands both take under 2 minutes each and grant 35 & 30 Cov. Do those daily do not skip those tasty CoV quests (they are soloable by mostly anyone with any self healing)