No advice I’m afraid @Namechange1234589 but I share your frustration.
I was in a senior pastoral role (non-teaching), worked in the role successfully for a number of years. I asked to drop to part-time hours when I returned from mat leave and was told that the role was not suitable for part-time staff as they needed someone on site full time, and they didn’t want the inconsistency of a shared role.
I ultimately accepted a basic part-time role in the same school, multiple pay grades below my original salary. Sadly it is clear that I will not be able to progress until I resume full time, all new roles are advertised as full time, and they just don’t consider part-time for anything other than the lowest paid, most dead-end positions.
The sad irony is that the school have struggled to fill multiple vacancies, some of which I would have been more than capable of doing, and therefore posts have remained empty for months.
Education is not a flexible sector, and it is decidedly backwards compared to many other industries now. Middle / senior management positions seem totally unattainable for anyone who isn’t available to work more than full time (our SLT routinely work 7am - 6pm on site, plus more evenings / weekends). There is a culture of martyrdom, if you’re not working to breaking-point, you’re not working hard enough. If you have other commitments (family / children / anything), then you’re not dedicated enough.
The system is broken, and it’s too busy fighting fires and trying to tread water with outdated systems to think strategically or move forward to a more efficient and effective way of operating.