Definitely congrats on approaching 30 women. The only way I feel to cold approach is to say something that ENGAGES them in conversation. I'm somewhat of a natural conversationalist, so I don't have as many problems as most. My problem is I've learned to be friendly to people, not the alpha male who just doesn't give a ****. I try to keep the conversation riddled with playfulness to keep this from happening. It's not easy. Sometimes it can come off like I'm trying too hard to keep it going. You kind of have to act like you just turned around and said whatever came to your mind to engage. It can't seem rehearsed or like you thought about it at all. Guess what? That means it can't be rehearsed or like you thought about it at all. 3 second rule comes to mind.
What it really comes down to, is, as it's been said: PRACTICE, PRACTICE, PRACTICE. You have to be a conversationalist to approach women and close, period. It's just that simple. Some people are naturals, some people learn. If you have to learn, you have to try and fail. Period. Talk to every person you meet, practice C+F on your momma, break into new social circles as often as you can. After a million "wow that was a stupid thing to say," you will, in time, feel comfortable in any situation and look like you are walking on water.
Women are only attracted to the real thing, and being that real thing is what we're all striving for. That means you genuinely, at your core, have to be a Don Juan. Canned lines don't work. Transforming yourself is what this site is about.