What is the point of clean install every month? Is there a problem with your Mac during that time? If not, you are wasting time doing a clean install every month.
So many people don't understand modern macOS. As
@gilby101 correctly said, macOS runs from a signed and sealed image. Every macOS installation (of the same version number) is bit for bit identical. Reinstalling the OS replaces a fully working operating with a bit for bit identical copy. That's a waste of effort.
Weekly I shut down my laptop (I leave on and just let it go to sleep) Reset my ram. Clean my trash, inspect, delete as needed my cash files, erase all unwanted browser history items, cookies, screenshots, etc. used to wipe and clean install my os every 2 months.
That might be fine for a Windows machine (I haven't used modern Windows), but everything you mentioned is a complete waste of time on a Mac.
- Cleaning RAM? That's not even a real thing.
- Cleaning trash–not a thing, just empty it.
- Deleting cache files–waste of time, you're erasing optimizations that the system has built and it will just rebuild them.
- Erasing browser history–you can do that if you're concerned about prying eyes, but it does nothing to make your system run better.
- Cookies–same as browser history.
- Screenshots–what? Those are just normal files. You can delete any file you're not using. They don't influence how the system runs.
- Wipe and "clean" the OS–total waste of time as mentioned above.