I make $100,000 working 4 days a week so I take home about $70,000
It's highly unlikely that you will find a job making anything near as much in Poland, and certainly will not find a job that enables you to save so many dollars a year. Unless you get a job at an American company and get transferred to Poland at American wages, but that is usually for high-level technical and financial specialists, managers, administrators and consultants. Otherwise, you are going to take a painful cut in total earnings and an even bigger cut in savings potential.
You might consider early retirement to Poland once you have enough savings to comfortably live off. The one thing you have to consider is that the cost of living relative to wages is much higher in Poland than in the US. That puts a major dent in your ability to save. Right now, you are probably able to save as much as you would be able to earn in Poland.
Of course, a lot depends on your age, your job, your education, your experience, your skill set, where you live in the US, where you will be living in Poland, why you want to leave the US, and why you want to return to Poland. The more generous the information you provide, the more accurate the responses you will receive.