Maybe the one I shared with the crackling fire in the background, while having the drone ambient is the way to go for
long sessions of focus. An idea could be to listen to 2 things at once - like another natural sounds video that is relaxing,
combined with the drone loops that can get a little intense after a while.
I guess setting timers for breaks can really help too,
the more radical approach would be to even do the monk style thing with 45 min focus, 15 pause,
or tweak these to for example 90 min and 30 min etc.
I'm currently experiencing the lack of pauses, doing some physical exercise in between seems like a good idea.
When going more extreme on some days I for example went into nature to enjoy the weather afterwards
and wanted to read but realized I couldn't.
Same applied to a full off-day on the lake - I just "was" and that was what I needed.
But I scribbled around and created a nice logo, so that was the best I could have done