Sticking Point

so i have this girl who's my co-worker that I'm trying to game (please don't try to talk me out of it). I went out drinking with her a couple of times, dropped her home and was invited me up but i declined because she was drunk, she didn't insist. got a lot of good vibes from her including touching and hugging. I use to text her and talk to her a lot, both when at work and in the office, this included disqualification and negging. but now i feel as if the spark has died. i don't know what to say to her or what to talk about. I'm running out of things to say. I want to bang her, but don't know how to revive that spark me and her had. any advice?