Really, in the end, we all have to find our own way to let go.
For me, in some instances it has meant realizing my struggle came not from letting go of the person ( because they were long gone), but of letting go of the expectation, or disappointment, or hope I had in connection with the person.
In other cases ( as with my own father) it has meant detaching emotionally even though he is not going to be completely out of my life until one of us dies.
Both are difficult, necessary, and entirely possible.
You done good, Danna.