I upgraded to 4k 144hz. If this is something that you've been waiting 12 years for, I would do it.
Assuming not, I would look at amd + new display combo and if its still more expensive, look at at the difference and if its worth it for the future (depending on if you want to keep your monitor forever)
I'm sure you can find an rx 6800 for 250$US. You cnab prob fidn a 1440p144hz for 200US
gl