I jumped from 1080p to 1440p/144Hz after using a mates screen for a few weeks whilst he was away, and I loved the difference! My GTX970 didn't have too much trouble either at the time (playing mostly PUBG and CSGO then), but I am starting to feel it slowing down and dipping well below 60fps in some games (with a variety of settings I might add) has reduced my enjoyment somewhat. And like many others I suspect, reluctant to spend the money required these days to see a reasonable jump in performance.
1440p 144Hz High/Max settings, does take a lot of CPU/GPU power to run that
consistently.
However, I kinda cheat with my RX580 8Gb.
I too have a 1440p 144Hz Monitor, and only got it recently...
I regularly have to trade between (beautiful visuals for a game like Assassin's Creed: Odyssey at High/Very High settings, getting [1080p 50-60FPS] ...
Or for purely competitive play, like Battlefied V in 1440p Low/Medium settings, hitting 100-120FPS.
Is there something stopping you from doing the same?
What about upscaling the res from 1080p, or the opposite, say 1440P but only 80% resolution ( remember that 1440p has almost twice the pixel count compared to 1080p { approx 1.8x } ).
If you got a GTX970, what CPU are you running?
And yes, probs worth waiting for something decent to come out mid 2019...I am sure there will be many more options to choose from (rather than have to go for an overpriced 2060/2070...).
But don't underestimate the RX580 8Gb or newere RX590 8Gb...they are excellent 1080P card and pretty good 1440P ones too (as long as you're willing to sacrifice a few settings at times)..