I come to realize there will take some time until the idol culture can be as popular as ballad and hip hop. But that doesn't mean they can achieve success and be profitable for their companies. Here is a list I think they should do:
-Move away from the Kpop influence. Fashion and hairstyle is ok, but music and video concept should relate to what's popular in Vpop. Look at Erik and Duc Phung. They look like idols, but their music appeals to the audience.
-Work harder, promote often, be active on sns and regular comebacks. One of the biggest mistakes UNI5 and other groups are doing, is going into hiatus like soloists for a long time, and expect success when returning. It works for soloists, but not for groups. They need to work twice as hard as soloists to get get some recognitions. It's a reason why UNI5, Monstar and Zero9 are completely stuck where they at. They follow the strategy of soloists and it doesn't work for them.
-Skills needs to be much better. I don't expect Vpop groups to be as good as Kpop in dancing and stage presence. But I think they can do better and narrow the gap to Kpop. When dance cover groups are more synch than Vpop groups, then somebody is not training enough.
I think with these steps, groups will get respected and even gain a foothold within the general vietnamese audience.