No passion for my successful business but need to grow it to sell it

I own a business that is technically successful, but through watching other live coaching calls I have figured out that some of my challenges in growing my business are because I lack passion for my business.

I want to grow it and sell it in 3-5 years so that I can fund my retirement goals, but I want to know how to channel some passion for this so that I can get a greater sale price for it and move on to do something else I am truly passionate about.