Several things I would try: Not in any particular order
1. Jump the solenoid to see if it will turn over . if it does it may be a bad solenoid. If it doesn't could be starter or power issue.
2. Take out the spark plugs and see if it will turn over. if it does you may be hydro locked, crank it like that and see if any fluids come out.
3. Have the battery load tested to verify it is a good battery (at autoparts store).
Get back with us with results, that will tell us where to start for our next troubleshooting