Please see well-informed comrades and give some advice. Should I stay and help such a boss?

He is still using you, which means he is still giving you a chance. You have to grasp that everything is from quantitative change to qualitative change. You are in a difficult time now. After this trough, you will make progress, work hard and constantly improve your ability in the process of hard work. Sooner or later, you will become an indispensable figure in the leader and the company.