problem with hdr iphone12 upload blurrs colors when exported

when exporting my video after cutting it with premiere pro it blurrs the colors. the ones that teach me how to make youtube-videos told me that this problem can be solved by just disabling the standard-settings of my iphone12 for hdr which I now did. However I want to save the hours of created content yet.

this is the original color.
I also found another fix here which I also do not understand.
https://www.youtube.com/watch?v=0Z_-nnfrPnE
I found this guys fix here but cant bring it to work because I cant open the project as him:
https://www.youtube.com/watch?v=cIgnyx5KXQM
generellay speaking I am a noob in premiere pro: I really need a help via teamviewer or a simple solution step by step to save my files / make them usable for export.
