Temper is also my problem. For me, if I lose temper and have bitterness within, to repent and pray for changing is most helpful. Sometimes when I almost lose my temper, I quickly go to pray and get wisdom from God, and I could overcome.
How can we overcome our temper?
somebody advised me that thinking ourselves not a victim is to overcome temper.
Believe in God who loves me. Accept His grace and try to live happily
Simplest way is to leave the tempter origin. We have feet. I will choose run away and not close it.