Renovation or demolition and new construction - decision support from the architect?

and I also tried to draw the floor plan. It's my first time using this program,

Oh, please no. It is always "broken telephone," what information is lost when non-drafting experts transcribe plans. That affects the quality of the help possible, I'm out then.

Oh, please no. That's always "Chinese whispers,"

I don't know what's wrong with you: that is unmistakably the house of my paternal grandparents, considering it was drawn from memory by an amateur. However, there were two openings from the kitchen to the living room and from the living room to the guest room, and everything was a bit bigger. I once traced it in 3D and virtually moved in because I found it so successful. LOL That still applies, by the way. But as I said: it is a bit bigger.