How can I get his attention and get him to DM me first?

I met this guy at a party back in September and he’s really cool. We flirted that night and recently I heard from a friend that he really wanted to “do stuff that night” and hang out with me and my friend again when I asked him but he couldn’t since he was really sick. He’s on my close friends on Instagram and he sees my stories but I want him to dm me. Is there anything I can do to get his attention?

How can I get his attention and get him to DM me first?
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