The majority of business owners of businesses put their heart into building something out of nothing. The mornings, the late evenings, the solving of endless problems, all this gets into the identity. However, here is the unfortunate reality that most business people come to know after some time of running a business: if your business cannot operate without you, then it is not an actual business. It's a job.
You may be intending to sell in two years or twenty, but knowing how to make your business sellable is one of the most intelligent things you can do at the moment, not to exit, but to keep your own head.