So this is a crapshoot--don't know if it would work for you--but my sponsor suggested to me that i begin to pray for the people i held anger for. my mom was the test case.
she also told me that when you start out, you don't have to feel, or mean, the words you say.
well, she was my sponsor, and i was determined to do everything she told me to do (she has 25 years good sobriety). so i did it.
it worked.