Go to your laptop settings and check if the trackpad is enabled or disabled. There might be a possibility that the trackpad is unintentionally disabled on your laptop.

If the trackpad is not enabled, try connecting an external mouse to your laptop with a USB port to confirm if the issue is with hardware or software.

If the trackpad does not work even after connecting the external mouse, visit your laptop's website, search for the touchpad driver, and make sure it is updated to the latest version.

It is also possible that many applications running at the same time on your laptop can cause a software logjam. Close the apps that you don't use and then see if the trackpad starts working again.

If none of the above solutions resolve the issue then the best option is to either replace the faulty trackpad or contact the laptop's manufacturer for further technical assistance.