i did gravel worlds in 2019 because my in-laws live in Nebraska, but being around Boston there's not really a ton of unpaved roads to ride regularly, and haven't done any of the new england based gravel events (my impression is that it's a bit more technical than midwestern gravel).
personally, non-competitively i'm aiming to average 21mph for a local century route I do once or twice a year, have done sub 5 a couple of times. I don't necessarily need more power to get my goal, just need to keep working on my position. but i should seek out to do more competitive events that favor my particular profile