My advice would be to use your free time to improve your existing skills. Use these skills to find a better paying job. Maintain a technical blog. Give a presen

My advice would be to use your free time to improve your existing skills. Use these skills to find a better paying job. Maintain a technical blog. Give a presentation about something not directly related to your current job. Chasing side-income is tough and difficult to maintain. Or use your extra time for non-monetary pursuits. You only have one life.