I went out to a club last night and k-closed one girl and f-closed one girl.

I first had EC with an HB6.5, then just said Hey and asked her her name, danced a bit and kissed her. (And returned to her later)

Then I lost her cause she went to the bathroom, so I came across another girl (HB8) on the dancefloor. I kind of just stood in front of her on the dancefloor and didn't really dance. When she came closer I backed off a bit. So she came closer again and I backed off again. Next, she tries to come closer and kiss me, but I wouldn't let her. Then kissed her myself.
Thing is, after a bit of kissing I wasn't really sure how to keep her and she started to turn around to her friend and gave me a weird look. I saw that the attraction was gone so I moved out.
I was at the point just clueless what to do. You couldn't talk because the music was too loud. I couldn't just keep kissing her. As I didn't really dance in the first place and cause I'm not a great dancer I didn't want to go down that road, either.

Do you have any ideas of stuff you can do in such a situation to keep her interested? Preferably with as little words as possible

Usually Ill just lead them by hand to the bar or somewhere quiet very rarely do they not come

Exactly. Grab them by the hand, or tell them where to go and let them lead while keepign contact with the lower back/buttocks region.