My recommendations, since many have already written something about the planning:
1. Think through the pathways! You will walk the paths inside your own house hundreds of thousands of times. Are the paths coherent? Complicated? Or even very impractical? (Example: The way to the toilet upstairs from the bedroom is really, no matter which "airlock" you choose, really unfortunate.)
2. Do the rooms fulfill their function? Or is it difficult somewhere? (Example: Relatively narrow paths in the kitchen and pantry.)
There are two things that helped me back then:
1. Actually laying out the rooms with ropes, etc. on a large meadow. To get a feeling for the paths.
2. Visiting model home parks and imagining that you would have to live in those houses – what would bother you? (And model homes are often designed more for looks than for function.)
There are also the topics (a) does the house use the property well, and (b) is the planning economical? (Every square meter costs a lot of money!)
Based on that, then develop a rough idea which is then worked out with professionals (i.e. architect). In the end, something often results that is quite different from the initial own ideas and drawings.
I know this is not the answer that was hoped for here. Maybe, with some luck, however, it could provide some ideas to consider in the next planning. Building a house is a long process.