You need to do some traveling around the world to experience different cultures and environments and see how you feel.  Regardless of what anyone recommends here, different places around the world suit different people.

Are you willing to learn a new language?  If not, that will narrow your potential countries greatly.

Having traveled to 18 countries so far, I would likely choose Bali.  But I personally wouldn't choose a place to "settle".  If you prefer something else in the future, why restrict yourself to a single place?