Can I downgrade my iphone after downloading the latest IOS?

Hi

I am using a mac - Mojave 10.14.6. I never upgraded because I don't want to change to apple music. I like itunes and don't want to chance losing all of the playlists that I have set up in itunes. My library is on a 4TB external drive.

My iphone is an 8 Plus. Software just downloaded is 14.0.1 and this new version will not let me sync my itunes with the Mac without upgrading my mac. Can I get back to the previous IOS somehow?