Truthfully, it doesn’t matter what your accountant, attorney, partner, friend or lover thinks the business is worth, only the market (willing buyer, willing seller) can provide the correct answer.
There is of course a way to at least start with a “defensible estimate of value”, which is otherwise known as an appraisal.
Business owners want to know when the best time is to sell. The answer is sometimes simple, pick a number and when you hit it, get out.