It sounds like you didn’t fully answer the question, “What are you FIRE-ing to?” before actually FIRE-ing. Or once FIRE-ing you realized what you thought you wanted was not actually what you wanted.
So the question is, you’ve currently attained lean FIRE with geographic arbitrage. What would full FIRE look like? How much more would you need to add to your stash to achieve full FIRE?
Other than intellectual stimulation and English speakers, do you like the other aspects of the country in which you live? Depending on the country, intellectual stimulation and English speakers are not hard to find. Just look for meet ups (
www.meetup.com) — there are usually native speakers who want to learn English. Or as previously mentioned, hang out in the expat communities or attend expat events.
However, if you’re actually getting tired of your host country, then you need to think about adding to your stash so that you have more flexibility and options.