The term “essential services” can mean different things. In fact, the state, county, and city where my law firm is located each has similar but different definitions. However, the important thing to know is the term “essential services” is used for purposes of pandemic orders as an exception under which you can (but are not forced to) stay open for business. Those that are classified as non-essential don’t have the option to stay open.
That being said, if you have contractual obligations with customers, breaching those agreements by voluntarily shutting down probably isn’t a wise decision to make. Again, check your contracts (e.g. force majeure clauses) to know your rights and then talk with the other parties to discuss temporary suspension of performance if you want to shut down but aren’t required to by the government.