story
1. https://www.keyvalues.com/ is great job board that has some companies that explicitly claim they have work/life balance. The writeups let you see working hours in some cases, for good or for bad; make sure to read them, they all have different definitions of work/life balance.
2. You can apply to any company that sounds like it'll be reasonable, and if you get a job offer negotiate a shorter workweek. I've done this, and I also interviewed someone who did this at 7 or 8 different companies: https://codewithoutrules.com/2018/01/08/part-time-programmer...
3. Negotiate a shorter workweek at your current job. Actually easier than finding a new job.
4. Just... work less hours. I.e. you're at normal 40-hour/week job, and you just work 7 hours a day. If you're good at what you do you'll be just as productive, if not more. I did that involuntarily at some point due to RSI limiting how many hours I could type. No one complained about shorter hours because I was productive enough. Downside is companies often judge you by hours in office, not by output (https://codewithoutrules.com/2017/06/21/why-company-want-lon...).
I cover these and other approaches in my book: https://codewithoutrules.com/saneworkweek/
Southern Europe really has an "ass in the chair" perspective to work, despite resembling relaxed/lazy to the outsiders.
Netherlands and Nordics, from what I heard, are the opposite.
The benefit of being officially on part time is that it sets everyone's expectations and shouldn't negatively impact your promotion trajectory, especially if you're able to fulfill your duties on a part time schedule.