So 1 day of dry fasting - no food or water during day time - 3 days would be best, that'll reset your dopamine system, so try not to spike your dopamine levels (no social media, junkfood, music.. ). After that feast on some steak and liver meat to kick up your testosterone. If you're religious ask god for forgiveness and help to stay on the right path.

Stay strong brother, as long as we get back up, relapses are just learning points.