Just can't get good at building?

this is gonna sound dumb but try building shells (so just outside) based on houses you see irl. this is mostly to make yourself understand how the house is structured and then you get the whole inside to go wild.

when it comes to roofing try and roof the biggest 'piece' of the roof first and then use small pieces to fill in the space. my origin id is blackrosespl if you wanna have a look at some of my houses and how I roofed them