OP walk me through some of your past attempts, keep it 100
It's kinda cliche sounding but confidence is 100% the key, admittedly I don't often 100% cold approach, I usually approach women that I see more than a couple of times
See each other a few times, exchange glances, smile
Then one day 'Hey I keep seeing you around you live / work around here'
From there you just have to keep the convo going try to ask questions if you stuck.. you should be able to identify common ground
Travel to party destinations also helps greatly with confidence too, my recent trip to Vegas I was approaching groups with my phone out on some 'Whats good for tonight?' Someone always grabs the phone

*spoiler it was Drais every night

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I came home and found it hard to turn it off
*Keep in mind if you go in 100% cold, after you get the number its a whole different game, more times than not she aint gonna reply

She prob gave out her number a bunch of times, she will reply if you got the sauce

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