Go to the club and scope it out. See what music they play, what the crowd is like, and how things operate.
From there you also might get ideas on how to present yourself. Remember that most promoters think of money, not talent, music, etc. The reason why many places will pander to mainstream masses is they want to make money. DJs might not like it, but crowds do.
The guys I notice who get booked are the ones who either can “bring heads”, or the business-savvy ones who are all about helping the club/promoter/night grow and make money.