You will be bored if you don't have challenges. Challenges keep you alive. Find challenges that are MEANINGFUL to you, so even when you tired, you feel that it is totally worth it.
Maybe, think about this moment from the perspective of a 70-year-old you. What would she tell you to do? Or, if you only had another 5 or 10 years on earth, what would you prioritize?
Thanks for your suggestions! I always challenge myself in my career, that really keeps me alive and happy. So far, I couldn't imagine myself to be 70-year-old, cause I don't know if I want to live so long