When I first got minecraft 3 years ago I built a lot of houses but now I can't even build a small house in creative. Can I play minecraft as if I just discovered it?
Knows exactly what you mean, but I think the only thing you can do is hit your head until you forget everything, but it's not a very good idea. I'm sorry, but it's time to let go…
If it is the Java edition on PC (or Mac? W.O): Mods.
Otherwise: Unfortunately I can't think of anything other than playing drunk. ^^ ;;
But I play with mods
Then the only option I could think of would be: More / other mods.
And if that doesn't work either, I refer to Loewe1987's answer.
There's a video on Youtube called unspoil me. This is a hypnosis to forget about series or films and has worked for many. Maybe you could try Minecraft.