The phrase "is devoted to" can be replaced with many synonyms, depending on the context in which it is used. Some possible options include "is committed to," "is dedicated to," "is focused on," "is centered on," "is fixated on," and "is obsessed with." Each of these alternative phrases conveys a slightly different nuance or emphasis, but all share a common meaning of being intensely interested or invested in a particular topic or activity. Using synonyms can help to add variety and precision to one's writing, and can also make it more engaging and expressive.