The unemployment rate is very low, so to be able to hire factory employees you'd realistically need to offer at least 5000 PLN (~1000 USD) in gross salary.
You'd have a much better chance to open such factory in Spain or Portugal, the salaries are similar, but you'll have an easier time hiring + green energy from sun.
Can you please provide some sources for that claim?
For example [1] says that the lowest, starting salary is already over 3000. And the salaries for teachers grow with work experience.
[1] https://notesfrompoland.com/2022/10/12/polish-teachers-among...
Family who are teachers - but I guess the bottom of the scale has increased now, that's my mistake.
Also observe how the top of the scale is 64578PLN/year, and according to the article, teachers reach that level in about 20 years on average. So even after working in the profession for 20 years, you don't reach the average wage for your country when working as a teacher.
I suspect that you do reach the average salary as an experienced teacher.