Well, first issue in current monetary policy that would need fixing is removing zero lower bound from interest rates to allow heavily negative rates when needed

Well, first issue in current monetary policy that would need fixing is removing zero lower bound from interest rates to allow heavily negative rates when needed to manage aggregate demand more efficiently. (I understand that most people do not agree to this statement, but yes, to me it looks like aggregate demand needs to be managed in economy. And I do not know that many other tools than interest rate for that.)