So I went out to a open air concert and talked to some girls there, lets say in total I got 8 Instagram's with a 8/12 success rate

The thing is tho, from the 8 Instagram's I only have been able to set up 1 date, half of the others I got ghosted or was told they didn't feel like meeting up.

I'm wondering if this is just how it goes or if I'm doing cold approach wrong, cause at the concert I just went around asking girls like "Hey can I ask you something?" Which would 11/12 times be welcomed with a warm "Ofcourse!" Then I was like "I think you're really cute and I was wondering if you're single?" Which would usually result in either them saying yes or their friends getting excited and start laughing, eventually resulting in her giving her Instagram after I ask for it, but I didn't really make full conversations with anyone and wondering if I needed to?

I feel like there wasn't really anything to talk about so I just went straight to the point, anyone have any input?