IMHO: The best predictor for future IV is is the latest option prices (IV surface) for liquid products. Be careful when adding VIX as an influencing metric if it is NOT the proper metric for your objective. Note that VIX is merely the implementation of the algo provide in the CBOE VIX White paper, and likely is NOT a good fit for what you state. Start clean, and just look at the data more directly! For example, if you are pondering what ".SPXW200417P2875" may look like in 1 week if underlying does NOT move, then examine ".SPXW200409P2875"! for a projection assuming Vol surface maintains its current shape!
While this has no crystal ball, it is best guess with current info. Nice thing about this, is you can observe how correct it has been in the past and make your own decision on how to use it. - Extend this to project impact of underlying moves, for example, if expect underlying to move +25 point in 1 week, but same vol surface shape, look at SPXW200409P2850.