Being a very common phrase, there are numerous synonyms that can be used instead of 'being to'. Some of the synonyms are - destined to, meant to, have to, supposed to, ought to, required to, scheduled to, bound to, fated to, predetermined to, set to, expected to, and intended to. These synonyms have different meanings and connotations, but they all imply that something is going to happen or required to happen. By using these synonyms, writers and speakers can add variety to their language, avoid repetition, and create a more nuanced and precise expression of their thoughts and ideas.