Know when to fold 'em
Not that anyone here cares, but I think it's just time to quit. A long time ago I reached 2500/Veteran once. It's really my only goal every season. But since then every single season goes the same way:
I get to around 2400, then I hit the RPS wall. I start getting ridiculous RPSs on every match. Imagine, for instance, opening your Greninja into a Forretress five times in a row. Having determined that at your ELO that's what's happening, you switch to a Talonflame lead, and open into Greninja five times in a row. And the back-line is just as bad for the rest of your team. Even worse when you get RPS'd by bizarre teams that would never work anywhere except when matched up perfectly against your own.
My favorite was in the last cup, where a Quagsire running the well-known tech of Stone Edge/Drain Punch was there for my Gyarados and Umbreon.
The RPS goes hard until I hit 2000 or lower, then it stops, and I start the crawl back up to 2400.
It's not that I'm simply getting outplayed at 2400...I can accept those losses as part of playing the game. It's the impossible RPS matches that continue relentlessly until I bottom out.
I'm now about at the 2000 ELO nadir. Given how long it takes to get back to even 2400, I think it's time to just fold 'em for this season. Maybe after enough of a break I won't even miss it, and I can quit playing this time-suck.