If you have a PRO License, you can use the ENVELOPE to increase the Volume.
In Settings / Preferences / Timeline you can set the Audio Track Height. Click on the dropdown menu and drag the slider to the right.
https://docs.pteavstudio.com/en-us/10.0/project_settings_1/preferences#timeline
https://docs.pteavstudio.com/en-us/10.0/main-window_1/audio_files?s[]=envelope#the_envelope
DG