Do keep in mind, the last biomes left to finish are in fixed locations on every map, the far north and the far south. Now that Mistlands are finished, as long as you don't go into spawn range of the poles you can save those areas for when they finally get finished (which, at current dev pace, I predict to be sometime in 2028 for the next biome and 2037 for the last). Just focus your exploring to the east and west. It's what I'm doing on my Mistlands restart.

Of course, minor updates can still be a pain for this, like how when tar pits and ice caverns were added to plains and mountains long after those biomes were "live". Any additional updates to already finished biomes will still require hunting down an unexplored one to actually find the updated terrain.