If you are using an external microphone, please make sure that it is connected properly.
Follow the below instructions to change the boost level.
Click on the Apple icon and select System Preferences
Search for Sound
Go to the Input tab
Make sure that you are able to see a level increase when you speak into the microphone.
You can also drag the Slider to 100% to increase the volume
Now you need to allow kPoint to access your microphone. Click on Allow and Remember.
You will get this Pop-up when you start recording.