Often enough the mind stops responding to commands and questions after a breakup and what is required at the time is to get some advice or help that can start the train of thoughts back up in the head. These thoughts are simple and yet elusive. Hence, start searching for help with how to get him back and find all sources that you can get your hands on. Check with your friends and family members. Take their advice and weigh each against the other. If that does not prove fruitful then try online.
The internet should have something that you shall like and find workable with your talents and skills. Once you have found it study it well and chalk out your own customized plan based on those tips and tricks. After completion, find a right time to begin its execution and stay back to watch the ripple effects begin with the passage of time.