How can I make my bulbous nose tip sharper without surgery? (Photo)

You cannot, unfortunately, make your "bulbous nose tip sharper without surgery". 
Most reduction procedures to the nose require invasive surgery. 
Be aware that a rhinoplasty (esp. reduction rhinoplasty) is one of the hardest aesthetic procedures to do well and that revision rates are quite high.

Based on the photos you provided, you  have a bulbous nasal tip  The bulbous tip would need to be reshaped; grafts may need to be used for tip support.   Ethnic by far the most challenging cosmetic operations in cosmetic surgery. This because the anatomy and skin thickness requires special techniques to achieve desired results. Do your research online and try to choose a surgeon that can deliver results that you seek. They should have numerous before and after photos with results you like and seek. Choosing the right surgeon who has experience is imperative; you want to avoid any revision in the future. You can send me your photos for computer imaging.
Best,
Dr. S.