One team that has made noteworthy progress in the past few seasons: Carreira/Ponomarenko.
They were once considered a rising team in US dance, then dropped pretty hard. They only finished 7th at US Nats in 2022 before climbing back to 3rd and then 2 silver medals. At Worlds, it has been 10th, 7th, and now 5th. Pretty remarkable if you think about it.
Sure, mistakes by one team or another might have had some impact on that placement journey, but I believe that Scott Moir's coaching has more to do with their rise than political gamesmanship which some claim. They've made steady improvements in technique, performance, and placement since moving to Scott. Remember, this guy won both of his Olympic titles entering the competition as not-the-favorite (I think D/W were favored the first time he and Tessa won, and P/C favored the second time), so I imagine he knows what it takes to get a team to peak at exactly the right moment.
So, anyway, here's a young team that is in fact moving up against the tide of cemented placements, but few seem to appreciate them for it. On the one hand, we complain that the placements are locked in, and on the other hand we complain that skaters are moving up who aren't "supposed to."