Hello Joeyy Biden$$ please take a look at this map, Aim_Long(Dust) (CS2).

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3082605693

Maybe it will be an inspiration for your third arena.
The slopes make for good vertical gameplay, sometimes you can shoot through walls, a small feature of the map.
The map is really beautiful and coherent. Simple shapes, nothing to distract the eye, light and shadow fit together just as well as the textures.
And the map is complex enough to challenge you as a mapper, even if you copy some elements, there is still a lot of creative freedom.

I would be happy to play such a map in your arena!