I have no idea if cruise line operators read this site, but I'd like to throw something "crazy" out there.
The situation at the US border shows us that an unaccompanied minor which the deep state apparently wants in the country for all sorts of nefarious reasons, can travel freely with no ID, no PCR test, no vaccine etc.
I think that cruise operators ought to start providing cruises for regular US nationals that don't demand vaccines, COVID testing etc. Simply speaking English like a native and having a valid means of payment and perhaps an address should be enough especially if people will not be disembarking in foreign countries.
All that should be asked prior to boarding is the easily observed status of the person's health. Anyone that is obviously sick should be denied boarding until well. And I'm not talking an allergy or minor issue. Things like a hacking cough, vomiting, and diarrhea would be obvious disqualifications and hard to hide anyway. Plus, most people wouldn't want to take a trip in that condition anyway.
A cruise ship has the advantage that people can't easily leave. Given the duration of cruises there is little risk of an apparently well person in some sort of prodromal stage for an illness not showing any symptoms prior to debarking either back at the port of origin or else at a destination far away. If someone starts being sick on board, it should be possible, I would hope, to have a cabin or two designed to house them without exposing others with proper air circulation, etc.
I think a cruise operator, travel agency or some such with the moxie to do this would simply make a MINT from the revenue. All that stimulus money sitting in bank accounts and all sorts of people wanting a relaxing way to visit with others plus travel in the sun and sea.
If deep state criminals get to put their evil economy ahead of considerations like SARS-Cov-2, passports, etc. then legitimate businesses should be able to as well.