based on what I've read and seen in the game there is a big "gotcha" if you explore a lot of your world. Namely that the game engine generates the new terrian out to ~500 metersfrom what is shown on your minimap and that area is treated as 'explored' by the game . So once you see a location on the horizon it, and everything behind it for a goodly distance is now set in stone and will not be updated to contain new content as it is released.

if you use BepinEX mod loader you have the otion of using the "Upgrade World" mod which will reset areas of your map to an 'unexplored' state and will be regenerated with current content the next time you go near it. Part of the configuration of the mod lets you define areas that will not be reset, so your main homestead and any forward bases you have built can be protected.

on Thunderstore
https://valheim.thunderstore.io/package/JereKuusela/Upgrade_World/

on Nexus
https://www.nexusmods.com/valheim/mods/1485

I haven't tried using it yet so I can't give an opinion on how good it is. Be sure to back up your worlds before using it.

Good luck and good hunting