Here is a methodology that might help.

1. Understand that at some periods of the year there will be NO worklife balance. And that's ok. Try to minimize them and prepare for them.

2. What do you need these extra 10 hours per week for? Gym? Sleep? Family? Hobbies? Relaxation? Where would you start first?

3. Make a concrete plan on how to win back these 10 hours. Say No to some meetings. And learn to Say No in general, so that you make room for your Yes.

4. Create your boundaries and be accountable for them. E.g., no meetings or phonecalls after 18:00. No replies at emails during the weekends. Train others to respect them. Respect them yourself.

5. Work is also part of life. Work your way through feeling better at work.