How to maintain my mental health for it to be more active with healthy mind and healthy thinking? is it helpful to make a fixed timetable lyk when i should getup, about my workout, meditations, when to sleep etc?

Accomplish Something: Pursuing goals and engagement in life are associated with greater satisfaction in life. Having a schedule and sticking to it allows some people to become more involved with challenges that allow them to grow and to enjoy that process. Leaving many aspects of your life up to chance could decrease one's sense of accomplishment, which is also important to happiness. But some flexibility is good too!

Healthy: Absolutely. A healthy body creates a healthy mind. Diet, exercise & stress innoculation are parts of healthy lifestyle, along with holistic approach such as meditation, yoga, and plenty of outdoor activities.