Really the only way as an employee is to have a family because income tax depends on household size. And let's remember that there is a de facto second income tax (CSG/RDS) on top of the income tax.
But this is a small part of the issue with tax. Regarding employment there are the taxes paid by employers, as you rightly point out, which make the cost of labour quite high in France, but there are also all those other taxes on about everything.
But this is a small part of the issue with tax. Regarding employment there are the taxes paid by employers, as you rightly point out, which make the cost of labour quite high in France, but there are also all those other taxes on about everything.