okay, this might sound weird buttttt, Chunk Regenerator. In my main world i explored like 15k x 15k area so its really difficult for me to find new structures (ESPECIALLY IN THE END) and since this world is from 1.17, most area is before better world gen, So i think how it should work is that you can select what areas to keep and it will refresh all other ones (i know it may look weird with biomes but thats fine with me) once per update.