Stats cannot be reset
you can only get fresh stats on a new account...i miss family packs where me and my brother could make new accounts when we got bored, but microsoft got rid of it
On xbox one all the profiles on a single xbox one have Live now for the cost of one membership. You need a separate membership for separate boxes though.
You could try this...
You could create a new profile and start fresh. That's the only legit way.