Up your detail. Feu's points here are very important to look for . Repetition and even boring geometry can become its own thing if it is sprinkled with eyecatching asymmetry throughout. Your build here sadly do not do so.
I object.
I myself have issues building sometimes you know? You could take a quick look at the sources Feu linked, and also look up a couple of worldedit commands to help out with this. An artist isnt defined by their tool, but the tools are a big change here. Just copy and paste alone will not help out after a point. I recommend this channel known as Minecraft Buildtips? They have nice "objects" categories that are basically the equivalent of drawing a circle for new artists. Give it a shot!