I think at first you need some rest. Second, you need to accept that work cannot be interesting all the time. If that is a problem, consider moving to another project or role, not necessarily now. Different tasks and responsibilities often provide some entertainment.
I cannot say that I fully understand you, but I was in a similar situation many years ago, and I changed my role to engineering manager. However, I am currently feeling that it is not the most exciting thing too, so I have decided to make a game about my role to give more meaning to my work - https://devmanager.carrd.co/
I'm not sure if I answered your question, but maybe there are no good answers to your question.
I cannot say that I fully understand you, but I was in a similar situation many years ago, and I changed my role to engineering manager. However, I am currently feeling that it is not the most exciting thing too, so I have decided to make a game about my role to give more meaning to my work - https://devmanager.carrd.co/
I'm not sure if I answered your question, but maybe there are no good answers to your question.