Maintaining the self improvement journey can be challenging. My experience with poor mental health.see's me slide like you are describing. Once I hate myself again sufficiently, I tend to fall back on Gratitude, Empathy and Mindfulness. Starting a journal and recording 3 things I am grateful for daily. Being kind to others especially those I do not feel fondness toward. And taking time to forgive myself and understand. Like all things this to will pass. Take care.