It sounds like the keyboard needs to be replaced. One way to confirm this would be to boot up Linux on the machine. If the keys don't work in Linux, then the problem is hardware, if they do, then we know it is a problem with MacOS. Just follow these instructions to create a bootable drive, and then plug it into the MBP which is powered down. Turn it on and immediately press and hold the option key. Select the orange drive onscreen and it will boot Linux. This will take a little while as the flash drive is not nearly as fast as a hard disk. Once booted, choose "Try Ubuntu". It will load even more before you will be presented with a desktop. Open the app launcher from the left-hand side of the screen (it looks like a grid of nine squares). From inside, choose LibreOffice Writer. Once opened, press some of your keys that don't work. Do they work now? If they do, then I would try reinstalling MacOS. If they don't work, then you will have to replace your keyboard, which on MacBooks like yours means replacing the entire top of the computer. This is a very challenging repair, so you may want to see if you can find someone to do it for you. Apple won't do it, as your computer is no longer supported by them. If liquid has ever been spilled on the computer, then that could've been the cause of your failure, so be very careful when drinking and using a computer.
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