Luck with individual data?

Hi i’m currently at 0.212 with a baseline submission, i still don’t understand how to use the individual dataset. First i had difficulties reshaping data ID IID but my main concern is how to use it…
merging to have more features? but the household dataset is already overengineered; create some eignvalues and merge? I have no ideas, so if u have please share. i Feel i can go #1