The #steemexclusive tag can only be used when posts are published exclusively on Steemit. This way you can be selected to receive the Booming vote. Checking your post, however, it appears that it already exists on another platform
To use the #steemexclusive tag correctly have a look HERE.
I'm really sorry I didn't know about this, I'll use the #steemexclusive tag from now on and won't share this post anywhere else, thank you so much for letting me know.