Alge SV4S speech amplifier update

Hello, I add 3,5mm 4pin  jack connector on Alge SV4S speech amplifier for connect different headphones. After all I tested it:

-speakers - ok ( little noise, but its not problem)                                    -Microphone has very low sensitivity - can you tell me how to increase it?

 

Headphone parameters:           -Impedance: 32ohm          Sensitivity: 105dB +/- 3dB 
Frequency range: 20Hz-20KHz
Mic dimension: 6.0 * 5.0mm
Mic sensitivity: -38dB +/- 3dB
Mic impedance: 2.2kohm
Directivity: Omnidirectional
Operating current: Below 100mA
Headset interface: 3.5mm stereo 
Cable length: Approx. 2.1m / 6.89ft 
Headphone color: Black&red, Black&blue
Package content:
1 * KOTION EACH G1200 Headphone

Can you please advice me how to increase low sensitivity of microphone?

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