You may be suffering from androgenic alopecia or which is also called as pattern baldness. The hairs start reducing in density at the crown (top). This is usually progressive throughout life unless treated. The FDA approved treatment for this condition is minoxidil lotion and finesteride tablets. There is no other alternative. No oil or cream works will magically work because the hairs are getting miniaturised  and eventually disappearing due to the hormonal effects on the hair roots. Along with this, you can also consider platelet rich plasma therapy for faster results. Please consult me with photos for proper examination and treatment.