BE300 Pilot reported failure to report airport in sight in descent; resulted in ATC issuing a low altitude alert and a CFTT event.

Narrative

I became aware of a pilot deviation on Day 1. The flight date was Day 0. Because I did not receive a basher warning ('possible pilot deviation') I was very surprised when contacted. Also; because it had been so long since the flight occurred I did not recollect everything that occurred during the phase of flight. I did receive a recording to analyze; and help remember what happened during the flight.During descent we were cleared to a fix on an approach to maintain 16;000. During the descent we were given Pireps of icing around the area. Being below 18;000 we were in VMC conditions and advised that we were in the clear and should remain below the clouds for the remainder of the flight. A few moments later we received a low altitude alert; and advised we had the field in sight and would like to cancel IFR. We were then cleared for the visual approach and to squawk VFR Frequency change approved.Situational awareness; Crew resource management; advising ATC as soon as the field is in sight. To prevent this deviation in the future; changing operational procedures for the Pilot Flying to cancel IFR. Maintaining better situational awareness; and utilizing better crew resource management.Since receiving the notification I have reviewed numerous videos about the new compliance actions and would advise everyone to take some time to watch the information about pilot deviations.