The best way for your next game (or for anyone else who hasn't completed all the building tasks yet!) is to leave one unfinished (I suggest the rubble as it's pretty non-essential).

Then take a villager you want to build up (heh!) their building skill and put them on the rubble until it says "has improved at construction!", then Stop Them, and put them back on it.

You can train up builders in no time (compared to fixing huts) doing this, as long as you nurse them and don't let them complete the project.