Don't pick a country to work there. If at all possible get a location independent career or sufficient passive income that you don't even need to work except when you want to, and pick a country based on whatever you decide is most important, be that cost of living, lowest taxes, quality of life, cultural, social or political fit, whatever.

Nobody knows you as well as you know yourself and after many years travelling and seeing what the world is actually like in practical day to day life this becomes even more true and you know even moreso what is important to you.

When I left Australia well over a decade ago I had no idea that I would value the things I learned to love only by having access to them on a regular basis and realising that they were readily available as options. If I'd gone only to where my idea of what I wanted would lead me to believe at the time, I'd have missed out immeasurably.

Figure out the logistics for a quick recon of practically every locale that isn't a hard no, and while figuring out those logistics expect to add liberally to the hard no list, and build from those experiences.