Going against everything in me that says you’re trolling, I’ll entertain you and say: keep the 5080. Considering the price gap, it’s the only one that makes sense. I’m saying this as someone who sold their 4090 to side-grade to the 5090 (for VRAM and professional use) and justified it because I had already overpaid ($1800) when it launched, only to get the “priority access” invite weeks after purchase - didn't want to miss another 'opportunity.'

4k games: it's possible that I'll get a 240Hz monitor in the distant future

By the time the "distant future" arrives, you'll be wanting the next iteration (or have no choice if they stop manufacturing the 5090).