Identify which parts of your work you want to leave and which you would still like to keep. Reducing daily involvement, transferring management and selling ownership are different decisions.
Professional management requires more than hiring a replacement: people need authority, information and a clear decision-making structure. Remaining an owner also requires a defined role. A partial sale changes governance as well as personal wealth. Compare alternatives by the responsibilities they leave with you, and consider whether your actual wish is to end this chapter entirely.