MacBookPro power button stopped working

What to do? I live in a country where there are no official Apple service centers. There are only authorized centers, but their reputation is not the best.

Water got into the connection between the MacBook Pro 15" Touch Bar 2018 A1990

screen and the keyboard. I dried the laptop, and it's working again, but the power button stopped functioning, while TOUCH ID still works. After closing the lid and shutting down, the MacBook doesn't respond to pressing the power button. To turn it on, I need to plug in the charger. Additionally, the MacBook doesn't wake up quickly from sleep mode; it goes through a full startup process as if it were restarted instead of quick wake-up. Furthermore, the MacBook now shows the "in need of service" notification on the battery bar.