I have heard good things about Costa Rica and Panama (I'm going to lump those two together due to their location). I think those two might be some of the easier options to move to and fit right in thanks to the large expat communities and English being widely spoken. Now, I don't believe it is as affordable as it once was, but it's a good middle ground between the US and the cheapest options (I think in many ways Colombia is kind of what Costa Rica was maybe 15-20 years ago in terms of small but growing expat communities + affordability). But if you're considering a move you should absolutely go and check it out!