Hello, living with bipolar since 15 years is not easy, the fact that you have written this asking for help to find direction and purpose in life indicates that you are doing well, I would like to congratulate you for that first. As you have given very limited information about yourself, it is quite a challenge to answer your question directly. However, I can suggest you on how to help yourself in finding an answer to your question.
Sit in a silent and calm place and ask yourself; what is that I am looking forward to every sunrise? What makes the day interesting for me? Finally what life means to me?
Do not pressurize yourself to achieve too much or too big at once. Give time to yourself, love yourself and enjoy every single day.
For a better understanding consult any clinical psychologist or rehabilitation psychologist. Seek individual psychotherapy and attend any support groups if possible.