Blank App Store on Mac

Try this:

Check the status of your network on Mac

Check the status of your network on Mac - Apple Support

If your Mac isn't connecting to the internet over Wi-Fi

If your Mac isn't connecting to the internet over Wi-Fi - Apple Support

If they are On, turn Off Hotspot & VPN.

If you can't connect to the App Store, iTunes Store, or other Apple services

If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

👉 If you tried all of the above steps and you still can’t connect, contact Apple Support.

Is VPN off?

Get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.

Ahh OK.

See the following Apple articles:

If your Mac isn't connecting to the internet over Wi-Fi

If your Mac isn't connecting to the internet over Wi-Fi - Apple Support

Recommended settings for Wi-Fi routers and access points

Recommended settings for Wi-Fi routers and access points - Apple Support

If they are On, turn Off Hotspot & VPN.

Use Network Kit here, Is a paid app, but informative.

See -> Change VPN settings on Mac

Change VPN settings on Mac – Apple Support (UK)

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Options

Turn VPN session options on or off.

These options are available for L2TP VPN services.

• Disconnect when switching user accounts: End the VPN session when you switch to a different user account on your Mac.
• Disconnect when user logs out: End the VPN session when you log out.
• Send all traffic over VPN connection: Send all network traffic over the VPN connection, regardless of the network service you use to access the network (for example, Wi-Fi or Ethernet).
• Use verbose logging: Capture detailed log information during the VPN session.