Mexico has a lot going for it. Very warm&friendly people and culturally a bit closer to the west then other Latam countries. Spanish is not difficult to learn.

Politics/power structures are very complicated (federal/state/town/local tribes), but it has an advantage, not one of those is fully in charge. Freedom as a result of chaos. The covid period confirmed this for me. Some Mexicans were serious about things like masks, but they don't like to tell other people what to do. Mexico was probably the best country to be during covid.

It's big, so if you have a visa/residence, you can do a lot without crossing a border. Desert, jungle, beach, culture, mountains. National flights are good and cheap. In the high lands the climate is just perfect (for me). There are a lot of areas with year round avg daily temperatures between 22-30C (71-86F). No heating, no AC necessary. And when you feel like it, you go to the beach and it's always warm.

Oh your second question, for now I'm good here. But will check El Salvador in the winter. Argentina could be an option too, esp. if things change, either way would like to visit. Turkey is another favorite of mine, I like it there.