Keyboard quit working suddenly

Hi, my keyboard quit working again but this time I can't get it working. Only the power button works and I have to use a mouse and external keyboard to do anything. (It's just a regular keyboard, not a mac one.) I can't reinstall the system or do the PRAM thing to see if that would help because I can't use the external keyboard to do all those choices with command keys etc. I have looked on forums and contacted Apple, they just said to take it to a shop (which will cost a fortune for sure...) Everything else works fine except the keyboard. (BTW, I have a down cursor key which didn't work before this happened and have been unable to fix it. I don't know why that might have anything to with this problem, but who knows...) Any ideas out there? This forum is probably my last hope!

Hi, I took a screenshot on Coconut battery but can't upload it for some reason. It says:

Model Macbook Pro 12,1

Manufacture date 2015-06-1

Current charge" 1208 mAh

Full charge capacity 5480mAh

(charging at 22%) (yellow bar)

Design capacity - 6559 mAh

Green bar 83.5%

Manufacture date 2015-11-16 (can't figure out how they made the battery after I bought the computer?!)

Cycle count 1,368

Battery status - good

Battery temperature 29.4 C

Charging with 31.01 watts

Power adaptor - connected

Dynapack, age 2,889 days

OS Mojave