New rules for submitting maps.

In my opinion, the most important thing is to clearly indicate the type (single-player or multiplayer); everything else is just details.

I agree. Moreover, 10 people voted for point 7 (subsections), which is more than half. Sorting maps by sections will significantly simplify the search for maps, campaigns, and scenarios; it will also look more visually appealing and clear.
Multiplayer,
Single-player (scenarios)
Campaigns

Added 10 minutes later
I would add that points 1 and 7 received the most votes, which indicates their relevance. Although these points are similar in description, they are fundamentally different from each other, so I suggest implementing both options: 1 and 7. I am ready to help with sorting the maps. Leaving only point 1 and ignoring point 7 is not a good solution, as this would ignore the wishes of 10 people who voted for point 7