The bounce screenshot has PCM highlighted, but you are bouncing to MP3 (the blue tick), so you should highlight that so we can see what settings you have there.
Also, your mix is too simple, everything goes directly to the stereo out. You should route similar tracks to auxes (submixes), so you can submix them there and have more control over the coherence of the various elements.
Also, are all those plugins actually doing something? That is an awful lot of pitch correction, are you actually using that? Flex Pitch is a better approach for that.
https://help.apple.com/logicpro/mac/10.4/#/lgcpba8e3301
You may need to watch some tutorial video's on how to mix, to get a better grasp of that process. The (paid) videos by Macprovideo are a good point to start. (Im am not affiliated with them, other pro video sites are available) but I would start with pro video makers, there are just too many amateur badmixhabit instilling YT tutorial video's out there.
https://macprovideo.com/library/application/logic
also, this is a great site to get solid advice, the website owned and run by the writer of the official (used by Apple to train for Logic Pro X certification) Logic Pro book, David Nahmani:
https://www.logicprohelp.com/forum/
Mixing is not something that can be learned quickly in a day or a week, but once you dive into it using these resources you will improve quickly.