I would love to be able to do more diverse voices... But unfortunately I can't, so my party always get my deep deep voice for every character: man, woman or child
I think it's no coincidence a lot of voice actors got their start as DMs.
Have you ever looked at any online workshops/lessons on voice acting? They really helped me with the higher registers. I don't sound pro or anything but I no longer get complaints
I have checked some courses in my area, but they are all extremely expensive since they are for people who actually want to become a voice actor and not for someone that does it as a hobby.
I have never checked some tutorials on YouTube or maybe domestika, probably there I'll find something better suited for my needs.