DanMachi closed out its season with a bang as its 2378 Karma was not only its highest Karma Total of the season but also its highest karma total since its much anticipated Season 2 Premier got 2779 Karma back in Summer 2019. And yes, DanMachi really was big enough back in Summer 2019 to beat Demon Slayer. But a combination of bad pacing and poor adaptations caused opinions to fall to the point where DanMachi's Season 4 Premier last Summer got just 1353 Karma
People had come to think of it as a fun, fan-servicy (trashy) series with some cool fights sprinkled in but nothing to write home about. But DanMachi came back with a vengeance in Season 4 Part 1, finally showing off the quality that had allowed its source material to be significantly higher rated than even its well-regarded Season 1 adaptation. When all was said and done last Summer, DanMachi beat its 1353 Premier Karma Total 4 times in becoming just the 6th sequel ever to average more Karma than its premier. But that was just the appetizer.
Season 4 Part 2 sky-rocketed past even Part 1's feats in premiering with 1637 Karma and then surpassing it with 4 straight incredible episodes to close out the season, not only joining Part 1 in becoming the 7th sequel to average more Karma than its premier (1637) but also becoming just the 5th sequel to surpass its premier in 4 straight episodes.
And its ascendance wasn't limited to just r/anime. On MAL its past 5 weeks have looked like the following:
The back-to-back .06 jumps from episodes 9 and 10 alone make up a higher rating jump than most anime get all season.
TLDR: DanMachi absolutely killed it this season, revitalizing the series. I would highly recommend for anyone who was previously put off by the "Is it Wrong to Pick up Girls in a Dungeon Name" to give it a try as Season 4 alone should make it worth your watch.