What ways can a young band promote themselves better to get fans?

I recently saw a new band I liked and was thrilled to not only meet them but show them my daughters amazing art and suggest a collaboration. They are same age as my daughter (18) and been playing a little at local bars and festivals as a support band. They have a YouTube channel and Facebook and music on various platforms but I think they need help getting more out there. I'm thinking they need to do shorts and takes, maybe funny rehearsal clips and stuff. But what else? Any advice? I want to help them!

What ways can a young band promote themselves better to get fans?
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