Those battery saving or process monitoring apps are sort of a scam. The battery saving app eats from your battery life as well. It's like anti-virus programs on a PC, totally unnecessary. I haven't used them in years and everything works perfectly fine and fast on my PC. Instead of these battery saving or 'doctor' apps, you should only install apps you really, REALLY need.
Other tips are:
- Go to Setting>General>Background app refresh>toggle them all off, or at least most of them
- Notifications>Toggle off the apps you don't want to be notified about
- Brightness not on Auto, keep it on the lower side when indoor
- Settings>Privacy>Location Services>Filter the things you don't need (like calendar which you don't need location for)
- When going outside, turn Wi-Fi off. It drains your battery because of the constant searching for Wi-Fi connection
Good luck!