if you start new map i am looking for people to play with let me know :D

Old maps will only populate areas unexplored.
So you would have to find new biomes for the new stuff.

Note the game will take a while to update your save when you first start it, just wait it out.

Personally I think you should restart. They made a lot of changes to food and progression so it feels very different from before H&H.

New character on new map to experience all the changes fully.