• Draft Book A.
• Give Book A to beta readers.
• Start outlining Book B.
• Make beta edits of Book A.
• Send Book A to pro editor.
• Complete outlining Book B.
• Make pro edits of Book A.
• Publish Book A.
• Draft Book B.
• Give Book B to beta readers.
• ….
• Repeat for 50 years or until out of ideas.