Just texted my crush happy birthday and he replied, how do I continue the convo?

So I like this guy at uni and we’re basically friends and I have him on socials. It’s his birthday today and I wished him happy birthday saying:

”Omg happy birthdayy!! Hope you have the best day💕💕”

and he replied: “thank you so much!!! I appreciate it❤️❤️”

I don't know if I’m overthinking but I feel like that’s more of a friendzone response? Also, should I continue the convo or just like his message?

Just texted my crush happy birthday and he replied, how do I continue the convo?
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