This his how I would do it.
Create a page with a form for the user to input their info, title, body text…
then with code make that form info create a post with a category only for this.
finnaly just show this on your page, or have a specific page to show this posts only.
Using only elementor, its possible to create the page form, and in the beginning add a custom shortcode that gets the form info and create the post.
To give here the shortcode code to insert into functions.php only having the form values.