How to flirt with a guy?

there’s a guy working in a bar downstairs, and I think I’ve got a crush on him. How do I flirt with him to show I’m into him? FYI, we always say hi to each other, so he knows me.

should I follow his IG or what?

Updates
+1 y
P. S. I found that he was on Tinder, but I didn’t want to swipe right, just not to look too obvious
Updates
+1 y
I swiped right his profile on Tinder, we didn’t match
How to flirt with a guy?
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