My partner likes to listen to lofi music. Lately she’s been obsessed with Baldur’s Gate 3 so she plays a youtube video that’s 10 hours of the “down by the river” song and a campfire sound from BG3. We’ve also done a 10 hour Star Trek TNG bridge noises video before for awhile lol
I think upgrading the RAM as you mentioned is going to make a big difference. While the physical RAM might be soldered to the motherboard, you could buy a fairly cheap SD card or USB and set the system up to use that as virtual memory. It won’t be as fast as actual RAM but it might help and large SD cards are honestly really cheap these days.