I agree with OP and Manka so very much.
You have to rest in your own desire to create.
But, because I see statements like this turn into a sort of general notion of “it’s bad to want validation or attention or engagement”, and to me, that’s not what this means.
It’s perfectly valid to want people to like and engage with what you create. In a general sense, when you create anything, you do it to share with other human beings. Art, craft, food, anything you create is a way to connect with others through our shared humanity.
And wanting someone to like you fanart or read your fanfic is part of that.
the words used by OP is decouple, and this is important. Nothing wrong wanting engagement. But it cannot be tightly coupled with the drive to create.