Why was my post deleted for no reason?

Link to the post?

https://www.millennialtraveller.com/start-blog-college-students-beginners-part-1/

If you edit the post, is the text there?

Are you using the Classic Editor or the new block editor?

New block editor

The text is there, but the view is blocked once I reach the third or forth block in the post…

Install the plugin “Classic Editor” and see if using the Classic Editor on that post makes a difference.

Unfortunately it did not. The text was still missing. How could this happen?

A number of things are possible, from database corruption to oopsing when you thought you were editing something else.

Via PHPMYADMIN, find the post in the database. Is there anything in its contents there?

Where is the PHP Admin please?

I definitely did not delete it or the title and keywords would be gone also.