Screen becomes red or pink

@rowenabina67059 sounds like a bad display. Replace it and re-evaluate. Since iFixit does not yet have a guide for that, use this guide It is written in Spanish, so use a browser that does the translating for you, if needed.

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!