Could start a new account to sell items not linked to your store. That way there would be a clear-cut separation between the two. Anyway that is just a suggestion, maybe someone will be able to point you in the right direction.
It can be good to have 2 accounts anyway. You can put all the slow bad stuff on one account and the good fast selling stuff on the other. That way people browsing your good store see good stuff and the bad stuff doesn't hold the good stuff back in the algorithm. That is why I have a trading card store and an everything else store.
