regularly should I oil the and wax the block? I have been applying conditioner regularly, but it didnt feel like it was doing anything. the board has been treated with several layers of polyurethane.

Never, it’s not going to do anything as it’s not going to permeate through the layers of poly.

You may be getting confused with the butcher’s block used for food prep and as a cutting board which you don’t usually leave unsealed, or sealed with wax.