If the goal is to reach more people and get more users/developers to be part of Nostr, I think it’s best to keep going around the world. Australia is another option as well as South America. 

Furthermore, nostr:npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f237lmu63q0uf63m mentioned going to different continents when talking to nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx.