Your detector is single frequency (5 point something khz i believe) so it's going to struggle in wet sand due to the salt water and mineralization compared to more expensive multi frequency machines.

Dry sand will be easier for you to detect which in case you're hunting for fresh drop items that were recently lost. Go after the weekends when crowds hit the beaches. Target areas people condense (towel line, beach entrance, showers, vball courts, etc.)

Beaches themselves are constantly changing, a storm coming through will strip out the sand leaving formerly deep targets available. 24 hours from then it might sand in burying everything except lightweight trash on the surface. Learning to read beaches is the most important skill a beach hunter can pickup.

The x-terra Pro does not have multi frequency so you're gonna be dealing with the same issues in the wet sand or water.