The best thing to do now is to work on research (while making sure that your villagers still have enough food). Once you get to higher tech levels, you'll find other construction projects that your villagers can work on (and get experience in construction). Start checking different places on the island after each technology purchase to see what new things you can do. I'm pretty sure that one of the projects can be started when you have level 2 of certain technologies. As soon as one of your villagers has some construction skill, they will start on that new hut (and you can use that to train more villagers, too)!
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Barbara
Unicorn
Last Day of Work