I was given some writing from Egypt to check. The person who submitted it said that the level is C1. I put it through the free grammar profiler and it gave me the following information. It predicted that this writing is actually C2.
My main suggestion is to include a modal verb as you can see in bold. Otherwise, I believe this is very advanced writing. Although there is no C1 or C2 grammar in the text, the correct usage of a variety of structures, and the advanced vocabulary clearly make this a piece of writing from an expert user of English. I would only suggest looking through some of our C2 grammar points here.