Reinstalling OS X
I keep getting this message when trying to reinstall OS X
MacBook
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Do you have access to another Mac computer where you can sign into the App Store using your Apple ID and download the OS. Then quit the installer. You can make a bootable USB stick to install using these free programs which will do all the work for you. Boot the computer with the option/alt key held down and select the USB drive. Run Disk Utility and select First Aid. Then re-install the OS.
Bootable USB Flash Drive – Diskmaker X Disk Creator or use Apple’s method Create a bootable installer for OS
If you can't get Mavericks, see if you can download El Capitan.
Or check the computer requirements shown in each link to see if your computer is capable of running that OS version.
How to upgrade to macOS Mojave - Apple Support