I'm  very sorry about your situation.   (We were booked on a river cruise out of Amsterdam departing April 8; obviously that did not happen.)  It's pretty difficult to believe that your cruise will take place (and, if somehow it does, you'll have to decide for yourself how safe you think you would be flying and traveling internationally right now; it's not something I would do).   You should be monitoring your United flight(s) daily; they make changes all the time and don't notify their passenge