The operating system does not boot.

I transferred the data from the old computer to the new one. I haven't used my old computer for a long time. I'm trying to turn it on now, but the operating system won't boot.

An error with a flashing question mark and a link: If your Mac doesn't start up all the way - Apple Support

I tried pressing CMD + ALT+R keys when turning on the computer. I connected to wi-fi, but I can't reinstall the operating system.

You can see my old user and the data on the computer has not been erased and because of this there is not enough space to reinstall the operating system.

It is not possible to delete data in the disk utility.