Chance for your map to be popular is geting into "Trending" tab, if your map will get into it, it will 100% get views diamond and downloads, and if you will update this map (what is very important in my opinion) it can get 300+ downloads (and of course at least 1000 vievs).
Important things, not about making the map but about publishing it:
- Attractive screenshots, a very good idea is to use shaders.
- Good, not too short and clear description.
- Updating map is important not only because it is getting better after every update, but also it gets into "Updated" tab.