Ways to increase building skill?

I am level 2 in everything so far, destroyed all the totems except the blocking, hollow, and that one that gives access to the hidden grove. I've already built the two spare huts, rebuilt the statue, built the clothing hut, and built the aqueduct. However, my builders remain at the adept level, though I have a few that are close to master builder status. I want to tear down the blocking totem, but I need three master builders to execute the plan. (Or so i've read.) At the bare minimum anyways. I almost have that, but I cannot see anything else that needs repairing, that I can access at level 2 anyways. Are there other ways to improve building skill? I heard you could fix the two additional huts, but how much more skill would that give my builders? Are there any alternatives? I am really stuck on this one, i've searched and haven't found any successful answers to help me. Any help would be great appreciated! Thanks in advance! By the way, this is my first post, I apologize if this is in the wrong section. I looked through the sections and I thought this was the most fitting, but apologies again if I was wrong. Thanks again!

This post should point you in the right direction.

Thanks anyways. I just kept them on the huts until they mastered the skill. Took decades but succeeded. Was able to destroy the blocking and hollow totem (after a fierce impregnating period) and was able to convert the chief. So, mission success. Now if only there was an easier way to acquire energy aside from impregnating everyone. Cause I never find enough relics. Oh well, maybe in Virtual Villagers 6! Thanks anyways! Much appreciated!