Black Clover's latest volume has the announcement that the series has reached 24 million in sales
The last such sales announcement for the series was 19 million back in 2023 when the movie released. So it seems that the series has had an additional ~5 million sales in two years despite the manga being on hiatus/seasonal Jump Giga releases (only 2 new volumes with the third just releasing now) + no anime until the recent announcement.
seems as if leaving WSJ for Giga was a successful decision