Get a volt meter and make confirm there is power going to the starter. If your solenoid is starting to go out, you can usually tap that part with a hammer. If there's power going to the starter and its doing nothing, its probably time for a new starter.

If ya got pwr and Ground and its not the iggy switch it probably is the starter , pull and take it to the auto parts store , they can bench test it for you Tom
Note if its a top mount DONT leave the core there !