How do I view my own posts?

Click on your name > view profile > Subscriptions > Filter > from there, choose Content and then either Following or Participated or Authored. That should get you to the posts.

Edit: I just checked your profile and this post is the only one listed. Note that the entire site here was "remodeled" a few months ago and older posts have (temporarily we are told) disappeared.

I apologize for overlooking the date of your only other post - from November 2018 - included in the "lost posts" from before the SiteWare was changed on Dec 5, 2018

Itunes Digital Booklet - Apple Community

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braydon111 site:discussions.apple.com - Google Search

found it

Yep. They did change things. The wheel is rounder now?

What you need is in the same place that "Content " used to be, if that's any consolation