Unsending an Instagram message after a year?

I sent a message to someone on Instagram over a year ago, neither of us follow each other.

I'm assuming they never saw the message because to this day it says "Invite Sent" and that I can't send them any more messages until they accept my invite.

So, my questions:

-At this point, is there any way I can unsend the original message?

-If we both follow each other NOW, will the message on their end pop up as a normal message in their inbox?

Unsending an Instagram message after a year?
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