So, if you switch to Delta from B6 and from Alex Platinum to Delta Reserve, you can accomplish quite a bit. The Delta Reserve card from Amex will give you lounge access to Skyclubs, and it has an MQM boost at $30K and $60K of 15K each time. Your 65K miles flown plus 15K puts you over the 75K threshold for Platinum Medallion. If you charge $60K, you'll have 95K miles and can rollover the extra 20K MQMs to the next year, which would be handy if your flying decreases again.

As a PM, my upgrade record is abysmal, I wrote elsewhere that I flew 12 domestic flights in six weeks recently and upgraded on only two, both out of Seattle (it is more than 10%, tho). However, as a PM you will get better IRROPS service, you can redeposit award tickets for free, and depending on your destinations, you may get upgraded. If you look around, quite a few people are upgrading over 50% of the time. You also get RUCs as a PM, which are hit or miss, but I used two for next week, and have two seats in Delta One on the redeye SFO-JFK next Monday.

Also as a PM you will be able to choose Comfort+ seats, with it's slightly more bearable pitch. As a 6'2" person, regular Y will be terrible. I saw you don't check bags, but you also get three free 70lb bags. caliform mentions DM status, but you need to charge $250K for the waiver. Now, I would not say that Delta values your loyalty, actually quite the opposite, but it is more bearable with the small niceties Medallion status affords.