Melvor Idle is a great call. The base game is a solid idle game and there's a load of mods too.
I did a HCCO12B (Hardcore combat only, 12 bank slots only) run when the game first released.
Reinstalled the game yesterday and started another HCCO run using the new mod, it adds some QoL and tweaks.
My only negative about it is that when playing normally, I always feel like there's a perfect/optimal strategy and I should figure it out before playing.
There are other alternatives too, like invidious. The yewtu.be instance works decently well for me but limits to 720p I think. There is a list of all running instances somewhere on the github iirc. There's other instances that allow full HD, just have a search and you should be able to find one.
Up until recently I was using a gtx 1060 just fine. Not sure about the high end ray tracing stuff though.
I'd say give it a try, I had a great experience. Never had any proton issues with an nvidia card my self. Just keep in mind nvidia drivers on Linux are notorious for being bad. If you choose an LTS distro or one that packages the drivers you'll be fine though. Pop!_OS LTS with the nvidia drivers is what I ran.
Thanks for putting it into relation to daily use. 200,000 is not realistic though. Just had a google and found this source citing up to 400 metric Tons/day
https://maritimepage.com/fuel-consumption-how-much-fuel-cargo-ship-use/
12 is 0.6% of 200,000 btw