Advise needed on trimming down my Michigan Wolverines collection

[Porbeagle]

Good morning fellow collectors. I've been collecting all cards of UM players in college uniform plus the occasional pro uni auto for over 10 years now. But lately I have the feeling that my collection has grown far too large with too many cards in it I don't really care about that much. Plus card companies putting out sooo many cards of players even in college uniform nowadays makes it really hard and expensive to chase after all of them. I mean, do I really need all the 217 college cards of Karan Higdon, a player who didn't have a particularly remarkable career at UM and won't do anything in the NFL? And do I really want all the 100 or so college cards of Brady Panini is throwing at me each year now?

So I'm thinking about drastically trimming down my collection. However, I don't want to part ways with ALL the cards. But I'm having a really hard time deciding which ones to keep. Do I only keep the cards of certain players? And how to decide which players? Or from certain years? Or from certain sets? Do I only keep the autos?

I would love to get some opinions on the matter. How would or did/do you decide what to keep and what to trade/sell?