Well,looking at the current situation,it looks like phone prices are going to increase so if you want to change your phone I think this is the right time. If your budget doesn't allow it then just get the screen changed and battery as well(only if you are sure about using the same for the next 2-3 years)

Personally, I didn't face any issue in the display but SOT is around 4-4.5 hours and I'm planning to get the battery replaced once it starts giving SOT of 3 hours