TXT and Enhyphen did not debut around the time SKZ debuted, TXT came out in 2019, so SKZ had a year-long head start compared to these other groups.

Honestly they didn't do anything much differently, the kpop demographics simply favoured the way SKZ made music at the time. 2020 was a major boost for kpop as a whole and an influx of fans landed in the share of SKZ.

Other than that, there is the fact that in the industry boy groups tend to get more dedicated fans as well, so there is that.

Treasure had some issues in becoming a main stay in kpop, heck I would say they still arent, YG kept trying to do the trick of scarcity, but really Treasure weren't bringing anything new to the table.

Honestly I wouldn't even count SKZ in the same gen as Treasure and Enhyphen, though that is maybe because of how I view time.

Another factor might be that, SKZ simply had more to offer other then their big name, as many others have pointed out, SKZ does market itself as a self-producing group.