How do I get my crush to notice me?

So I have a crush on this lady at work. Grown ups have crushes too, I'm sure you've been there, lol. I say hello to her, and she says hello back. But what else do I do?

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How do I get her to notice me?
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Also, I have her phone number. She sent me a video of when my job threw me a birthday party.
How do I get my crush to notice me?
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