Need advice: how to text my crush without it getting awkward?

There's this boy I like, and he's in my class. I got the courage to ask for his Instagram, and he gave it to me. We haven't really talked before, but I finally took the step and wrote to him. The thing is, I don't really know how to keep the conversation going. I want us to talk more often and not let the conversation die, but I don't know the right way to do it. What can I say to him so we can keep chatting naturally?
Need advice: how to text my crush without it getting awkward?
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