I find kundalini kriyas difficult but very beneficial in clearing out that negative space that makes you want to forgive in the first place. To get your energetic field in the right vibration for forgiveness far and wide. This one is nice because it is to cultivate self love and acceptance from the hand over your head (arms and hands are an extension of the heart) and the free hand is used to push out love to the world, a specific person or situation.
Just bless em. Bless their life, their path, their family, their decisions. Blessing someone brings you freedom and lightens the load.
Also, chord cutting meditations.
YouTube has it all.