How to fix this

@sumitthapa time to replace your display. Since iFixit does not yet have a guide for this, use something like this video or even the guide from here It's for a Y20S but it's identical to your phone. It was written in Spanish so you may need a browser that can translate it for you.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!