I could live on 50% my salary now -- after building my retirement funds. I'm probably a lot older than you are. I'm not married. In Germany if this matters.

Progressive taxation and health insurance costs help a lot. You'll earn half the brutto, but the interesting question is the netto. You can run your numbers here: https://www.brutto-netto-rechner.info/teilzeit.php (in German)

1400 net can be a perfectly liveable depending on location / housing cost, but you need to think about retirement savings!

Could you take a 50% contract, and claim 50% social benefits? These last 50 won't be much but will help.

That's kinda what I do here in France, but I only get short contracts, then unemployment, then work etc to about 35~55% a year.

Another thing that helps is not going 50, but like 80 - it helps a ton to have 2 afternoons a week, I have many friends who did / do that.

My mother was a nurse, I feel you. Took early retirement as soon as she could.

Go half time and go back to school. Give yourself another option.

Could you go 50% and then use the free time to create some sort of side business?