Nexus321 dude! If you've spent years doing day and night game you already know how to talk to girls dude. If ya just got ya first kiss ya weren't getting sex... ya weren't.
What do I say to attract them? That ya rich an famous! Am joking with that...
It's not what ya say just that ya say it. Ya can say very little and attract them, get them talking more dude. Literally dude this site has so many articles to get ya started.
Read about approach anxiety, this is ya social anxiety guide. Just get talking to them and hang in there as long as ya can. Break the touch barrier, touch her arm, shake her hand, hug her just break the touch barrier. Encourage her to touch you. Ask her to stand, sit or move with ya for compliance. Run touch escalation or deep dive or both.
Ya can either baby step this by meeting girls, getting numbers, going on dates an escalating or try to push everything as far as ya can. There's arguments for both...
Ignore the whole a have a boyfriend thing it can be genuine, a shit test or a polite rejection. Keep going to find out. If she does have a boyfriend that's not ya problem it's hers she has to decide to stay loyal or cheat ya not doing anything wrong.
Attraction will come from ya fundamentals, how ya look, how ya stand, how ya walk, how much of a sexy vibe ya give of, ya voice, ya social skills. There's way too much to think about.
Start with fundamentals an approaching dude!