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Use an USB mouse
If your laptop's touchpad isn't working when you try to use it and you have tried everything else, and if you diagnosed that the touchpad itself is defective, and nothing can be done to fix it, use an USB mouse. USB mouses have a USB port and are mostly used by laptop users.
If you have the touchpad not working issue and your laptop is no longer under warranty, you can take it to a computer repair store (don't take it to a computer repair store if it still is under warranty because you will lose your warranty rights). The repair guy will diagnose and solve the problem.
If you have tried everything else and it didn't work, the only thing left for you to do is to replace the touchpad. It is not a simple procedure and you should be very careful because the computer components are easily fragile. Buy an original touchpad assembly, which you can find in authorized stores.
If you are willing to take the risk, watch this video (which is applicable to all laptops) before you try to replace the touchpad: