I’m so sorry that this is happening. I don’t know if it can be fixed. If you have spent two years living in different countries then the relationship was already in trouble as people just grow apart, and the fact that you were willing to move without her / she was willing to let you go probably means there was already a lack of commitment to the marriage, on both sides. My husband and I have turned down many overseas opportunities so that we can live together.
From her point of view, it makes no sense to leave her country, (family?) friends, and job for a permanent move to a foreign country unless she is 100% sure the relationship she’s moving for is rock solid. Even less sense if she isn’t fluent in French and a big fan of the culture.
Going to France will not make you stop arguing. Setting up a yoga retreat will not make you stop arguing. If you want a more peaceful job (or yoga!) those things could have been done without moving country.
There are people in super stressful jobs who do not argue with their spouse all the time. Healthy relationships are not full of arguments. Something is wrong. Maybe she’s right 🤷♀️ and you are a bad combination? It seems possible that you are trying to fix things FOR her, but not listening to what she feels is wrong. How did it come to be you on your own setting up the retreat, instead if working together? Why did it have to be in your home country not hers? Etc etc.
Maybe instead of emigrating she just wants you to admit that some of the time she is right and you are wrong? Does your vocabulary include phrases like “Ok if you think so, let’s do that” and “sure why not” or do you automatically try to lead on every issue / contradict her all the time?
What does SHE want out of the next year? If it was France and yoga she’d already be with you.
I absolutely don’t mean that this is your fault (for all I know she might be a difficult person) but I’m trying to help you see some of the things that have gone wrong so you can see the sort of things that would need to change to save your marriage.
Good luck and remember thst if it doesn’t work out perhaps there is someone else out there for you who is a better match and would love to set up a yoga retreat in France.