While I do agree that better categories are needed, I'd like to suggest an alternative to JohnGlacious suggestion:

Tags.

While Categories allow for broad categorization (and should definitely change on here), I don't think a lot of subcategories are the way to go, because a lot of maps can fall into multiple subcategories or genres. As such I'd like to propose a tag system, where the creator can select multiple (maybe max 5) tags that describe their map best. And then of course you should be able to search and filter these tags.

Tag ideas (not exhaustive): PvP, PvE, Boardgame, (remake of other) Game, CTM, Puzzle, Maze, Variety, RPG, Horror, Co-Op, Parkour, Educational, Seasonal, Maze, Unfair, Finding, Collection (of multiple games / stories / etc), Short, Long

An idea like this would genuinely be great and make PMC a much better host for maps.

I do hope we, eventually, get better categorization. Seeing maps & minigames such in either "Challenge/Adventure", "Redstone", or "Other" limits the access people can get in finding them. I also think if it's a server-based map it should be in its own category.

Please note what I'm about to say is purely to give an idea. Not what I would want it to be 100%. I am also giving examples in each instance of what would be in each category if organized more properly.
I would love to see it changed to AN EXAMPLE of the following:
Main Categories

• Journeys - builds that can be played through from a start to finish
• Minigames - builds that are transformed into games that can be played over and over again
• Inspiration - builds that are inspired by something or inspire people when looking at them
• Server - builds from a Minecraft server. Usually have a link to said server where it's from

Sub Categories:
For Journeys:

• Adventure - Builds that bring the player from the start of a campaign to the end of one. Usually have a predefined story alongside a fair bit of lore to discover. The story & gameplay is what carries them forward. EXAMPLES - Revengeance II, Detective Stories: Chapter 1, & Bendy and the Ink Machine: Moving Pictures
• Parkour - Builds that require players to jump across platforms as their main point of progression. While there can be mechanics, a story, or other stuff mixed in, jumps are the main thing that pushes them forward. EXAMPLES - Border Line 2, Parkour Heaven, The Dropper
• Maze - Builds that often compose themselves of twisting and turning corridors, forcing players to think about what path they want to go on. EXAMPLES - Maze Island 2, Find The Button - 27 Levels, The Complex
• Open-World - Builds that are very loose in gameplay and story, often making exploration be the real focus of what they enjoy. EXAMPLES - Severscape, Mega Sky Grid, Mosslorn
• CTMs / Complete The Monuments - A defined map genre that have a clear goal of completing a specific monument. These builds tend to be wondrous or mystical in how they're handled, but are all encompassed by completing the large structure. EXAMPLES - Diversity 3, Lumina Complex, The Good Old Days

For Minigames:

• PvP - The most common type of Minigame Genre. Builds that are designed around players going against each other in combat of any type. EXAMPLES - 100 Ways To Die, Backstabbed, Ruins of Altrac
• Escape - Builds that involve the players trying to escape a specific area. Whether it'd be a room or a prison. EXAMPLES - Toxic Escape, Cops and Robbers 3, Metel Remake
• PvE - Builds that involves the players going up against a group of mobs rather than fighting amongst themselves. EXAMPLES - Defend Helms Deep, Chunk Defense Rework, Illemana Defense
• Game - Builds learly defined as a game. It has a timer, objectives, and clear cut goals on what needs to be done. Usually can be PvP based, but often than not is just a fun time waster. EXAMPLES - Kitchen Burnout, Building Game Redux, Toy Tank Royale
• Other - This is where Other will be moved to. This would involve builds that aren't specified in how they're handled or have too many moving parts to simply be categorized down. EXAMPLES - Super Voxel Party, Minecraft Party 2, Wii Party in Minecraft

For Inspiration:

• 3D Art - Builds clearly made to be 3D-like models of existing things. EXAMPLES - Raven Nether Portal, Giratina, Lotaviin
• Environment / Landscaping - Builds clearly made to be large landscapes without many extra mechanics built in. EXAMPLES - RUNETALE, Bikini Bottom, Roman City
• Pixel Art - Builds clearly made to be pixelated designs. Often bordering the 2D style. EXAMPLES - Ant Scale World Flag, Pokemon Sprite Museum, Sans

And finally, for Server.. you don't need to put any more categories into it. It being a server should already get people along and it would avoid a lot of it being mixed in with other maps.

As stated, this is purely noted to be an example. I don't expect it to be followed to a tee nor did I list all of the possibilities and genres that Minecraft maps have. There's so many out there like Puzzles, Horror, Experiences, Challenges, Boss Fights, etc. that it's impossible to get everything down in a simple list.

But it'd be cool to start seeing more categorization and improvement so that way it's easier to find what we want.

P.S. Please also separate Bedrock and Java maps.

Yeah, I agree. It's quite hard to place minigame maps. I put mine under complex and that doesn't really define what the experience will be like.