Upgrade your builder hut!
What i'm thinking is a new feature where you can upgrade your builder hut. Maybe a level 1, 2(Can ugrade on th8) lvl3 (upgrade on th9), lvl 4(th10) and lvl 5 (th11)
Each time you upgrade this builder hut, there's a boost percentage. For lvl 1 there would be no percentage, for lvl 2(10%), lvl 3(15%) , lvl 4 (20%) and lvl 5 (30%).
Let's say you have an air defense upgrade which takes you 10 days for it to be done. If you have a lvl 2 builder hut , the duration would decrease by 10% , which is 1 day in that case and the upgrade time would be 9 days instead of 10 days.
I personally think that adding this feature will certainly make the game less boring. Like seriously, 14 days for an upgrade this is too much patience. I hope supercell takes my idea into consideration, and no one plagiarizes my idea.