Hey there, unfortunately, this design isn't necessarily that unique, I've seen quite a lot of prison maps and most of them seem quite similar to yours even if your submission is an 'abandoned prison'. First thing I realized when I saw this map is that the outside of the map isn't very attractive, I would suggest adding some sort of decoration to hide the area a bad, possibly some rotting trees, overgrown bushes, etc. Speaking about the detail I would suggest adding some more detail to the prison interior as it looks quite bland with the mossy/normal brick combo every corner you take, add some depth into your build, some unique blocks and it will look much better in my opinion.
I logged onto parkour to give your map a try and from my perspective, your parkour jumps didn't really have much variety,
for example: add enchantment table jumps, possibly fence jumps, slime block jumps, soul sand jumps, etc.
Also when I reached the end I noticed that there's was basically just a big prison yard, barely any detail and honestly, I believe that you could have added something quite interesting in there, at the moment it's just a wide-open yard that looks very bland, I suggest adding some unique decorations to spice the place up, possibly some gym/training equipment, etc.
https://prnt.sc/s80w4i
Current bland prison yard ^
Best of luck on your map :)