Do you want to request a higher-level review?
No, at least not right now.
This is more about evidence. Evidence we didn't have before, my case has been decided this way, because we weren't able to provide the evidence that was needed. Now we finally dug it up. Can I add it to the case?
Of course. When you're adding new evidence that supports your case, a reviewer will look at all the evidence and determine whether it changes the decision.