Some options:
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/