The Coffer is always hungry, and even if we dedicated all our time to it growth would be slow. Growing the stronghold is a huge challenge that takes patience, organization, and determination.
Here is one view of how to optimize dailies to help the stronghold grow while using as little time as possible.
Be sure to have your characters boons filled out for the areas you're working on. We've always felt that character improvement should come before donating to the guild coffer. Besides a stronger character makes for more efficient questing, and faster coffer gains in the future.
What areas are involved?
Campaign currencies from Sharandar, Icewind Dale, Tyranny of Dragons, and the Dread Ring campaigns as well as the SH itself are all needed at various times.
Once the campaigns are completed, SH vouchers can be made from the Sharandar, IWD, and Dread Ring campaigns. Make these instead of donating the currency directly. The vouchers are worth ~40% than the currencies used to make them would be if donated directly.
The stronghold NPCs like the Master of Coin and the Cleric give out quests that are needed.
One optimization here is to make sure and do 3 HEs in the stronghold each day after getting the quest Defending the Stronghold from the Cleric. That will get you the majority of your influence for the day (345 out of 400) AND win 10 Adventurer's Shards from the quest. Both the influence and shards are very valuable for our future growth.
As often as you can, be sure to do the weeklies in IWD, Dread Ring, WOD, and Sharandar. They offer good value for the time spent, usually a few minutes apiece. Skip the WOD if you want it takes a while. However the TOD weeklies from the Harper in PE Defeating Dragons and Portal to Tuern are worthwhile. All of these gather a sizeable chunk of campaign currency for 1 task. Most of these will gain you a good amount of AD for your trouble as well.
Much time can be burned here. So lets work on optimizing this a bit.
Gather quests from each of the above areas, each day. Several days worth can all be done in 1 sitting to save time. Oftentimes you can be finishing off multiple quests at the same time in this way.
Get these quests when they are available in the SH from the Cleric and the Master of Coin:
Do something like this to gather stronghold donations and waste as little time as possible.