Research for the band: What song do you want to hear when you go out to see a band? Don't say Freebird or Stairway to Heaven; They're already in. Just tell me what you want and I'll do some math afterward. What do you want to hear?
The best way to be successful is to give the people what they want. That doesn't mean selling out; you still do what you want. That's what gives your music originality. Originals are always there.