I've tried to record my voice over a video, but it sounds too low (even if the volume of the speaker and Videoscribe is at the maximum level).

If I add a music tract, I can't hear my record voice clearly.

How can I have a higher volume?

probably something like this:

(image pulled from the internet)
Google search how to change your microphone record volume for whatever microphone and operating system you have.

-Mike (videoscribe user)