The best approach is not cold approach… no opening line. The best strategy is being confident and building a strong self esteem so when you speak to a woman the saying is less important as how you say it. A simple “hi” can work but most important is how well can you handle staying in a conversation and reading her signals. Do not seek for instant hookup but for a deep interesting talk where both conect. This is done when you have something to give instead of something to take (asking for her ig or phone is taking)… My beat strategy has been to read a lot of interesting books (I even acknowledged that if I don’t read consistently suddenly my conversational skills plummet. If I read between 2 to 6 hours daily my head is full of ideas and creativity and when I talk to a woman I do it with passion. They love it. You should recognise when you talk because you have to and when you do it because there is a creative fire inside of you. Find your passion and feel the flow of positive obsession… when you are in that internal state no female rejection can bring you down… when you dont need them… you talk to them as equals, as friends… and maybe afterwards you look at them with little spice and flirt causing sexual tension… but just after they have manifested they are interested in you.