Hey GewoonSJoerdYT,
I am sorry to tell you, but I am going to reject your map.
For it to be accepted and added to parkour, it definitely needs an original theme. Also ask other experienced players, to test your course, so they can give you their opinions on the difficulty, since your difficulty does not fit. Also the experienced players could help you with barriers, since they are a mess.
Thanks for submitting and I hope to see more in the future!