Sure, keep going to Alanon. It does not matter that the alcoholic is no longer part of your life.
Although he is gone, you are still feeling the effects on some level. That affects your reactions, decisions and how you handle other issues that have nothing to do with the alcoholic.
Don't worry! You will be welcome.
And if you feel recovered from XABF, the newcomers in Alanon will appreciate your E,S & H. Pass on the gift!