And still, "to suffice" doesn't take a direct object, so nothing can "suffice it"; perhaps something could suffice for it or to it.
Sorry, I realize I might have been confusing in my previous post: I meant to say "suffice" needs to either take a
preposition or no object at all. In this case, the object is clear from the context, so it's best to just leave it out:
"let me know if this suffices."