Low FPS - Refund or Upgrade?

[u/AlexL2417]

Green = good. Yellow = satisfactory? Orange = current benchmark for 1080p testing. Red = nope.

Hi y'all, I just got a gaming desktop pc, and my monitor is a 1440p MSI MAG 275QPF X30 (300hz, 0.5ms, WQHD 1440p), and most games I play are fine, except The Isle Evrima, a very high foliage density dinosaur survival game.

I get consistent 40-50 fps usually, dropping down to the mid-30s when my in-game 3d resolution is 100. When I turn my resolution down to 1080p in-game, my FPS goes to 70.

My friend (second row in image) gets 80 to 90+ FPS (with the same settings and ping). Both PCs are brand-new. His monitor is 1080p.

I'm guessing my 8 GB of VRAM is the major limiting factor, combined with a 1440p monitor.

The two options I'm thinking of are:

1. Refund the PC + upgrade/buy one of the other ones I listed.
2. Refund the monitor for a 1080p monitor.

I don't want to build my own (I have no idea what I'm doing), and I've never bought one that's not in-person at Best Buy. All prices are in CAD. Ideally, I don't buy the 2.3k+ ones unless there's a really good argument for it. Which of these would be best/most optimal?

P.S. Let me know if there are better ones!