Obvious example is Demon Slayer Mugen train but don't think anything will hit those heights for a while
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One that stands out is Umineko, one movie per episode would work very well.
The next three Kaiji arcs after Season 2 could be done in a movie each also (Mahjong Minefield, Test of Friendship and One Poker)
Das Finale Parts 5 and 6. Part 6 has the potential to eclipse the K-On movie.