How to fix Android phones slow down over time ?

1. Configure on-device developer options.
2. Enter Developer options.
3. Turn on Developer options.
4. Change Window animation scale to Animation scale 0.5x.
5. Change Transition animation scale to Animation scale 0.5x.
6. Change Animation duration scale to Animation scale 0.5x.
7. Turn on Force GPU rendering.
8. Turn on Disable HW overlay.