Diligence.
What still depends on you, and what it costs.
You get the read a buyer would run on the business, run first and run for you. Every place the business still routes through you, ranked by what it costs on the day you sell it or step back: the decisions only you can make, the knowledge only you hold, the relationships that would leave with you.
The deliverable is the Sovereign Audit: a written map of what depends on you and what it would take to change that, in the order to do it. Fixed scope, and the business keeps it whether or not anything follows.