Amplifying the output voltage from a coil (10Hz-20kHz) using an AD620 module
I didn’t manage to amplify the signal I need to amplify.

If you are talking about amplifying the coil signal (previous post) then I see where you possible went wrong. I've downloaded the schematic and added what you need to add: -

Basically, as I understand, you connected your coil directly across both inputs. If you do this then you need to add bias resistors from one or both inputs to ground to make the input bias currents (small but still relevant) pass the ground and correctly apply DC levels to your inputs correctly. You might get away with 1 MΩ resistors too but don't go lower than 100 kΩ in case it upsets your experiment.
There was also a small error in the schematic that I fixed although I expect the module you bought to be OK.