Hi Kamikazen, welcome back!
You can reorder reviews with the following userscript: (although i don’t use it)
It might take a while to get the hand of userscripts in general, but it’ll really enhance your experience.
The best for these amounts of reviews is indeed to just pick a number of reviews to do daily. The amount initially doesn’t really matter. One thing I would try is to do 60 in the morning and 60 in the afternoon. (or something like that). That way, you’ll probably deal with your fatigue, and get a substantial amount of reviews done. Ideally, you can get rid of a backlog in a few weeks.