Macbook Not Charging, SMC reset didn't work

Does the charger work when connected to another USB-C port especially on the other side of the laptop if you have four ports?

Try rotating the connector of the charging cable 180 degrees upside down to see if it makes a difference. I know this sounds crazy, but it may work if the USB-C port is half bad.

Try unplugging the charger from the electrical outlet for a minute to reset the charger's internal circuitry. Unfortunately there is no good way to test the charger except by testing it with another laptop or trying a known good charger with your laptop. Just make sure to disconnect all other external devices in case one of them is causing a problem and plug the charger directly into the laptop since a multi-port adapter, dock, and hub may not allow the full power of the charger make it to the laptop.

Most likely you will need to have Apple or an Apple Authorized Service Provider examine the laptop and charger to provide you with a repair estimate.

It means the laptop is not receiving enough power. This can be caused by just about anything: charger, charging cable, adapters/docks/hubs/accessories/peripherals, or a hardware issue with the laptop itself. There are also a lot of ways to damage the Logic Board through the USB-C ports especially if low quality accessories and peripherals are connected. I think you will need to have Apple or an AASP examine the laptop as well as your charger and charging cable.