I think this only works on foreign girls.

Just work on yourself. Get the $$. Be the leader of your social groups. Take care of your body. Do these things and if a girl is interested in you she will make it obvious. Approach her then. Don't just walk up to random girls its weird.

Stick your entire hand up there and call it a day.

I need more details.

Making an observation or casual complement is the easiest if they are a complete stranger.

If they show mild to moderate interest in your compliment/observation then you can start a convo.

If you can hold a short convo, or if you've already talked regularly for a while, then ask her out for coffee.

yeet