phono stage volume

a phono step up transformer might do the trick. These are typically used when driving a MM phono stage with a lower-output MC cartridge. Or a phono pre preamp will also accomplish the desired level shift, & possibly allow you to experiment with various loading & gain settings.

more likely your preamp has just jacks for external phono preamp.

Buy a new cartridge. It sounds like you are using a cartridge which is too low output for your preamp. Was the cartridge bought new? If so, I would hope your dealer asked you what preamp you are using.

If you do have a preamp for moving magnet cartridges, you will have to get a moving magnet cartridge, or a high output moving coil cartridge. I know the grado high output moving coil cartridges are fine with a moving magnet phono stage.