I would go .
You probably have as much chance of catching it at the supermarket.
Royal Caribbean is the best line to back you up if you catch it .
If you test positive before the cruise ,full refund.
If you test positive onboard,free medical and a refund plus they will put you up in a hotel for the time required ,all expenses paid and fly you home to your front door.Free of charge.
This virus is going to be around for a long time and you can’t hide forever.