I’m not sure how short I was but UA just offered me Platinum for 299k miles or just under $3k.
I never targeted Platinum, just Gold. I did hit it a couple of times but never made much use of the 40’Plus Points so very little incentive to go for Platinum.
I’ve read that people just ask for it and once every few years they will grant it but I don’t know how close you have to be.
After they emailed this “offer” maybe they wouldn’t grant it anyways.