I took classes for 3 years in middle/high school, went to a few meet-ups, and practiced whenever my family from Tahiti was in town. I was far from conversational though, and knew I would have to find an English-speaking company in order to work abroad. Over the course of 2 years, I started with my own company (who had an engineering office in France) and also reached out to similar American companies located in the countries I wanted to live. If you’re interested in tech, most large companies also have European offices and are used to relocating American employees abroad (Microsoft, Google, Facebook, Amazon…) My high-level advice would be: be persistent and have patience.
I’ve also met many people who moved to France to work remotely, study, teach, au-pair, or do research. There are plenty of ways to get here without speaking French (though it’s never easy), but I really advise you to learn the language when you get here.