Danyaal, as I said in my first reply overall the master was too loud for YouTube (not an issue on some other channels).
My suggestion would be to ensure the mix sounds balanced aznd then add a compressor and limiter on the master track to fine tune the final full mix and achieve the target loudness. I suggest watching Reaper Kenny Gioia Tutorials - #12 by TheMadman_tobyjenner the video in this post to learn more. Irrespective of the DAW you are using, the concepts he describes are universal.