The phrase "shift into" is often used to describe a change or transition from one state or activity to another. There are many synonyms that can be used in place of this phrase, depending on the context and the intended meaning. Some possible alternatives include "move into," "transition to," "switch to," "switch over to," "evolve into," "transform into," "adapt to," "adjust to," "settle into," "slide into," and "migrate to." Each of these phrases conveys a slightly different nuance or emphasis, so it's important to choose the right synonym based on the specific context and intention of the communication.