Hesitation when accelerating, code P0171?

The vehicle works perfect, but when accelerating it has a delay of approximately one second.

In other words, I have to press the accelerator almost to the bottom to have a good response.

I share some data.

I want to share other information, with a cold air intake the fuel trim goes up to 19.53. I have re-positioned the stock, and I have a better performance in "low RPM".

I should change:
-Sensor MAF (is new but not OEM).
-Sensor O2 (I have never changed it).
-Fuel pump?

I will be taking the car to a workshop to measure the fuel pressure and share the data.
I await your response, Thanks!