I don't get it

Rating: 8/10 (3 May 2020)

I saw the movie like three days ago and it left me weird.
I have since read many reviews and essays on it online, but still don't get the ending (and I could not find much about its Interpretation).
From what I've picked up on, the movie is mainly about critique on the destruction of individualism, manliness and the consumer-based society of todays world as well as the fact that fascism (The Fight Club) is just the other side of the same coin as kapitalism, not providing any helpful solution.
But that is like the first half of that movie.
After that the movie still starts with Project Mayham and that entire haluzination-thingy.
I don't see a real connection from that to the main topic of the first half.
I mean, the narrator does conclude that stuff by shooting himself and accepting Marla as his girlfriend, but why and how?
And doesn't that haluzination-thingy (Marla is probably surreal as well, just as the entire world, read the essays on jackdurden) make the entire thing kind of pointless and destroy the realism of the first half?
Is it just me or would it be a better movie if you just cut the second half and make the third act an exaggeration to tylers world-view and Fight-Club mentally nearly breaking the narrator and then (somewhat similar to that first boxing scene) realizing that this is not the way either. (ending, I don't know maybe even with a depressing ending of him realizing that there is no fulfillment for him, whatever)
I mean the acting, camerawork etc. on this movie is great and it even left me wondering how real my life really was (quite an achievement); heck I really loved the first half, but I just don't get the point of that ending...
P.S.: Please tell me if there is something I don't see here.