can’t post new or edit, get blank page

Hi, I had this problem and hoped that upgrading to 2.3.2 would solve it, but I continue to not be able to edit posts or post new pages. I can edit comments and others are still able to comment. I tried adding www to my page address under options. Everything works, whether I have https://www.kmareka.com or just https://kmareka.com in the options, except the two functions of editing posts and creating new posts. If I use the bookmarklet to post, the post gets put in my drafts, but does not publish.

Any idea what is wrong and how to fix it? A tech friend suggested that, if nothing else, I could start a new database and hook it up with another copy of wordpress for my blog, but that would mean two separate databases, not good for internal searching.