@leon3333333 - I find it hard to believe so many things going wrong. Let’s break this down into actions so we can peel back the issues.
Do you have access to a second Mac system which you can create a bootable USB thumb drive. Down load a fresh installer file from here [https://support.apple.com/en-us/102662|How to download and install macOS] then follow this guide to convert it into a bootable image [https://support.apple.com/en-us/101578|Create a bootable installer for macOS] once you’ve have it setup, you should be able to boot up with it. Can you get to that point?