By moderately you mean like one planet? That’s like skyfather level. Not sure I’d put sentry at that level but hard to say just where he topped out. Thor obviously did a lot of damage for all the good that did. Would depend if galactus could absorb him maybe or at least the seed power. Maybe complete disintegration would work? Hard to say what it would take to keep sentry down. Bfr could work I guess. Tbh if this happened I wouldn’t be surprised to see sentry appear to be getting the upper hand.