There are several synonyms for the phrase "celebrate expansion of services." Some possible options include "commemorate the growth of offerings," "rejoice in the broadening of capabilities," "mark the increase in provisions," and "honor the enlargement of amenities." These synonyms all convey a sense of recognition and appreciation for the expansion of a company's or organization's services, whether that be in terms of the types of services offered, the geographical locations covered, or any other aspect of growth. Employing alternative phrases like these can help to spice up language and make written communications more dynamic and engaging.