Vertical line of keys sporadically work

Hi I have a Macbook Air (end 2020, M1).

Since 2 days, some keys of my macbook stopped working properly. I first noticed it for the q-key. It worked less and less. I opened the key and cleaned it. Without the button, when you pressed the key, it worked 100% of the times, so it seemed to be a dust problem. I thought I fixed it, but soon after cleaning it still wasnt working propery. Then I noticed the 1-key also stopped working. Then after some testing i noted the following:

The f1, 1, q, capslock, and `- keys are not working 80% of the time. It seems like when I turn my macbook and twirl it around, it sometimes start working again shortly. Yesterday after cleaning the 1-key, it even happened that the keys were linked and pressing one would sometimes give the other as output.

I have spilled some coffee three years ago over this corner of the macbook. Could this still cause the problem?

What should I do? Should I clean every key one-by-one? Use isopropylalcohol with the cleaning?

Is there a method to change the key bindings? I have keys I rarely use, but the 1-key is important.