If you could not be successful in spite of preparing for 5 years, it means that you had made a wrong self-assessment about your aptidudes, attitudes and capabilities. You should start afresh but before that, introspect and make true assessment about your aptidudes and competence. You can also take help of your friends, relatives or experts in making such assessment.
Remember that you can be successful only when you try to achieve something corresponding to your aptidudes, attitudes and capabilities.