Placement of Wi-Fi Access Points in a Two-Story House

I'm working on optimizing the placement of a Wi-Fi access point in my home. Currently, I have one U7-Pro positioned on the first floor, which provides good coverage for the ground floor. However, the signal strength in the kitchen is quite weak.

https://preview.redd.it/u0dp3flga7de1.png?width=684&format=png&auto=webp&s=442b2c0acd71ffebc1a8d82f541a27da4202d867