What's the best way to get over self-harm relapse and good methods for aftercare?

Distract yourself. Whether it's taking a walk, or cooking, distract your. Rain from bad thoughts. (:

Self-harming after being clean for a while can bring you to feel weak or ashamed of yourself, and the first step towards getting over a relapse is understanding that going back to self-harm is not a thing to be embarassed about. Once you've cleared that, you should ask yourself some questions in order to understand what triggered you. Events such as the death of a loved one and break ups can cause different emotions and push you towards self-harming in order to cope. Seek out for help - don't keep your feelings bottled up. If you don't feel up to talking to anyone, writing about what you feel might just do it. Last but not least - look after yourself. Eat healthy, get enough sleep, exercise. Don't let yourself be overwhelmed by emotional burdens - try and overcome everything life throws at you. If you believe you can, you will.