OP, I'm definitely not a Night Club GP, but I'll give it a go from a Controller/CFO background. Without knowing your operational experience.
1. Cash management- make sure it's not walking out the back door.
2. Inventory management- make sure it's not walking out the back door or with worker friends. Have high/low price options. Never run out.
3. Bartenders, waiters and cooks need to be trained on how to make you money.
4. After the main drinking hours, you need to make the people thirsty again.
5. Market- Monthly or weekly set nights, people can plan on. People love having calendar events. Or around events.
6. Market- scale to demand. Looks like you're in Tampa. Raise prices and "Spend" levels based on how busy the market is. Work on Table Turnover with your staff. Get your fire occupancy higher and add expandable service areas.
6. Market- out of 15 spots, why yours?
7. Parking- manage your parking. Your customers only.
Was not personally in the nightclub world, but had a family member very active in the founding and running of a major nightclub in town. And I'd say the biggest lesson was to really understand who you were getting into business with, and that regardless of how long the relationship has "good" through the years, they can always take a left turn for the worse, and you need to put you first and do what's right for you and your family in that instance.
personalities tend to intensify with success and money, not relax.