There's this (largely unpracticed) idea on Wall St that every once in a while you should sell your entire portfolio and then decide which stocks you actually want to buy back. It's a way of dealing with the Endowment Effect which says that people have a bias toward overvaluing things they already own
I think every police dept should fire 10% of the force every six months, and let an independent panel determine who should be hired back based on interviews and unredacted copies of their files