Simple, drama-free, genuine answer? You develop a bond with your fans by doing this for a while and inclining slowly. That gives you time to get to know your viewers and for them to know you, and more opportunities to curate your audience (read: practice with tardwrangling chat).
HoloEN didn’t get that. They thought they were going to have modest success like HoloID and slowly grow from there. Instead, all the girls basically got 100k+ tourists all at the same time. Sure, many of those people slowly developed into genuine fans, but the Myth girls didn’t get the chance to do the reverse. To them, their fans have always been a gigantic faceless crowd. I’m not even really blaming them for lacking a real connection to their fans, it’s really hard to do unless you have other motivations to do so (like Kiara).
It does mean that HoloEN suffers from a long-term debuff that other groups don’t. Like, even in NijiEN, the fact that plenty of the girls are 3views probably even helps out the branch in the long run. Ever notice how the most unlikeable and obnoxious members there are Luxiem, aka the ones who experienced instant success like Myth?