May I suggest:
10. Turn Wyndemere into a Bed and Breakfast. People would flock to the Island of Helena's antics and get a chance to sleep in the same bedroom as the Great Faison.
9. Host Murder Mysteries. What a perfect setting for some great dinner followed by a who-done-it!
8. Sell your Lake Como place. George Clooney never visited anyway.
7. Rent Wyndemere out for Weddings. Perfect destination. Ball room, Parapet, windy cliffs for photo ops...
6. Sell off Faberge Egg collection.
5. Start a Go Fund Me Page to "Save the Cassadine Empire" you know you'd raise some serious dough with the evil-doers out there
4. Public Appearances. Sure, you'd have to mingle amongst the riff-raff but you could make some serious dough doing "Selfies with a Prince" and lectures on Medieval Poetry
3. Downsize. I know you are attached to Spoon Island but you could move into a nice McMansion in Port Charles. Think of the heating bills alone..and the ferry overhead.
2. Turn the Catacombs into a 'Haunted Walk" People flock to those things now. The tunnels are a perfect place to have a nice scare. Heather Webber would probably work for free or a few BLTs now and again.
1. Marry rich. I hear Paris Hilton is still available. Surely a good looking Prince like you would do well on the jet-set marketplace.