I'm still going through all of this, but it's feeling like an obvious move to switch to AS (+ OW/AA) as someone based in Seattle. Lounge membership is easy to get, the domestic route network is better, and the FF program seems easier to earn status with.

It looks like matching over to MVP Gold 75K isn't difficult, and then a $500 Alaska Lounge+ membership. Cheaper than keeping all of the DL credit cards.. I wonder if it's possible to get lots of MQDs with partner flights and have this work out in your favor. Worth taking a look.

I don't begrudge DL or anything, but as someone who's been PM or DM the last 8 years, it's quite the change! Flying less for work anyway, so it's all kind of pointless.