Antonyms for the phrase "from now in" suggest the opposite of forward progression or future orientation. Some examples include "in the past," "behind us," "formerly," "previously," "beforehand," and "once." These antonyms indicate a focus on the past or a fixed point in time rather than the future. They suggest the importance of reflecting on or revisiting past events, rather than always looking forward. Additionally, the use of these antonyms can indicate a sense of finality or closure, as if a certain chapter has been definitively closed and cannot be revisited or changed.