Hi Dale,
As you've found out, all the suggestions of kill switch, clutch lever in, and sidestand switch are red herrings because the starter solenoid would not click if they were the fault.
Try removing and cleaning with sandpaper the two starter motor cable connections. One is at the bottom of the starter motor and the other at the top. Both are accessible if you get under the bike and easier if you don't have a cat. The starter motor threaded connections are copper but the cable terminals can corrode as they are covered by rubber boots that can retain moisture.
P.S. Still got the red tins on.