Reason of  Play Store not downloading or updating anything:

• Examine Your Internet Service-To download apps from the Play Store, you'll need a good cellular data or Wi-Fi connection.
• Date and time of the last update-Due to improper data settings, some system services and third-party apps may fail. Make sure your device is using the network-provided date time by going to the system settings menu (Settings > System > Date & time). The Use network-provided time-zone option should also be toggled on.
• Bluetooth on your device should be turned off.-Toggle Bluetooth off in Settings > Connected devices > Connection preferences > Bluetooth or go to Settings > Connected devices > Connection preferences > Bluetooth.
• Make More Storage Space-When your device's storage capacity is low, several system operations will become inaccessible.
• Clear the cache and data from the Play Store.-Navigate to Settings > Apps & Notifications > App info (or See all apps) > Clear Cache from Google Play Store > Storage & Cache.
• The Download Manager should be reset.-The Android Download Manager downloads apps from the Google Play Store to your smartphone. If the built-in downloader is disabled or malfunctioning, you won't be able to install or update programmes.
• Google Play Services must be reset.-All Google apps and services are powered by Google Play services, which is a basic Android system. If you're experiencing trouble downloading apps from the Play Store, and everything you've tried hasn't worked, resetting Google Play services' cache might help.

Read More: How can I download apps faster with the Play Store?