I'm not sure why CartographyAssets sellers don't promote here more often. I have mine linked in my signature but really should crosspost a few more preview assets here. Maybe because it feels like the guild tends to be less Wonderdraft/Dungeondraft/Inkarnate map makers, and that's the crowd that buy assets. No, I know why, it's because they balk at the archaic forum... but yes, it's the best resource of its kind! I posted a couple of my things on DriveThruRPG and comparably much less sales interest, though I should still crosspost for the people who go there first.

Turambar's most recent pack happens to be of perfectly fine handmade top down buildings which may not be what OP wants but could be useful for making such maps!