Like many, I was on the apps and never really found my person. Either you'd meet and they look different, personalities aren't similar, whatever.
I deleted my apps 6 month ago, and have mostly been chilling. However, in the past two months, I've been gotten like 10-20 numbers through various activities. Going to events, hanging out with friends of friends, pool parties, LA type events and even the gym which I was told was a no go. Almost every single one of these has turned into a date too.
My method is just go up by saying something thats relevant to the event. I have never liked the compliment first method. I feel like women get that all day long and it doesn't help you stand out or seem authentic in developing a romantic relationship, but that you're just trying to crack.
From there, get some light conversation, and here is my close: I ask what she likes to do and then say "Do you drink?" And ask if she'd be down to get drinks later in the week (coffee/tea is another one I've used). I get her number and then send her a text about an hour after we meet. I almost always get a text back, but the best is when they say "looking forward to grabbing drinks on [date we agreed upon]". It shows clear interest on their part, and shows your conversation was notable.
Although I'm not Michael B Jordan, or the tallest, being confident while talking to these girls and not coming across as hella needy but just talking with them as normal, has gone a long way. Girls see right through guys who don't talk to girls often, or don't seem confident in asking them out. I see guys talking to the girls I go up to after, and their entire vibe can shift. You gotta know if she's not interested and keep it moving, but guys like to linger.