Users can access their account page via view/edit tabs. You can create a "Content" tab that shows content the user authored.
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Add a view to user tabs
- Create a content view with the url as /user/%user/content.
- Add a contextual filter for the content author id.
- Set the menu type to menu tab.
- Select My account link in User account menu as the parent.
After saving, the view should be available in the user tabs.