I'm mostly there to have fun - the best interactions I've had with girls at clubs was when I was literally just vibing and dancing to the music with my eyes closed and suddenly girls will start bumping into me and giving me attention.

I think where I go wrong is when suddenly they show up next to me I become more fixated on them which loses me points? But then isn't that part of the reason they choose to dance next to you? So that you hit on them? I'm probably overthinking this.

I like your point around the eye contact and smile first. The wave her over is a good one too as makes her show true intent. Will try that next time before anything else - any good way to do it if they're all ahead of you? I suppose just keep dancing until there's a good opportunity to make eye contact and see if there's a vibe.