1. Concentrate
Stick with UA/AA and shoot for 100k EQMs with current promos
or
2. Mid level on 2 or 3
I would broaden the net
UA
25k miles gets you e+; with DEQM, you only need to fly 13k. - 1 trip to Asia.
AA I see you are plat already, as you know
25k miles gets you gold; with DEQM, you only need to fly 13k. - 1 trip to Asia.
If you are creative, do a plat challenge, if on a reasonable fare, you get to Plat right away with 10k miles (note - ultra cheap fares get you only half credit on points- can get to gold). This will allow upgrades internally for low fees at 24-48 hours (gold / Plat) window.
If you have travel left, 2 options
*A lounge access in the US
go UA e+ but credit to BD / AC, so you have free lounge access at RCC / US clubs I think you only need 35k travel.
Free upgrades
If you have more than 50k travel left and you plan domestic leisure travel go US or DL. You may get free upgrades on your personal flights.
This is the best time to get status on any airline.