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.