I've noticed the seed hasn't yet been reset in the Nether which I'm sure is already known.
I suggest that the seed is either on a rotation of unknown seeds if possible, or in a way that its unknown and random gen every month

i understand the difficulty with nether generation over and over again, since bounding boxes and structures need to be on for the nether but not the OW which creates problems, and its not viable to setup a tp command block teleporting you around for 2 days loading a whole 500kx500k area for the seed to be set. I also just don't know if there is plugin support for this to do it in a simple way.

also having a few nether seeds might help change things up a bit which could be a cool feature

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There are programs which pre render chunks if this is what you are talking about. Not expecting a reply but if server lag is what you are trying to avoid here there are better solutions then just saving the same (seed or map) .