I accidentally deleted startup disc

sorry that was a typo it is

com+alt+R

If you can't start up from macOS Recovery

Newer Mac computers and some older Mac computers automatically

try to start up from macOS Recovery over the Internet when unable to

start up from the built-in recovery system. When that happens, you see a

spinning globe instead of an Apple logo during startup. To manually

start up from macOS Recovery over the Internet, press and hold

Option-Command-R or Shift-Option-Command-R at startup. Learn more about these key combinations.

If you still can't start up from macOS Recovery, you might need to

reinstall macOS after starting up from another disk or volume, or by

using a bootable installer.

Additionally, in order to reach internet recovery/Apple's servers, you need to hold down these keys while you restart until you see a spinning globe with a progress bar underneath. You can then release the keys and it will tell you how long it will be to get to internet recovery.

Hi

lets try following

There is the

cmd+R (which is restore from your disk)

and there is the Internet Restore cmd+Alt+R

you should try the Internet restore

When, where, how exactly?

Hold CMD+r keys on startup, choose Reinstall MacOS.