We will be taking a Viking ocean cruise in July. If there’s anything I can tell you about our experience, before or after our trip, feel free to ask.
While looking around for advice on our cruise, I found YouTuber Gary Bembridge, whose site is Tips for Travelers.
He mainly focuses on the big ocean cruisers, but he has a few videos about river cruising, too. Here’s one.
Although I haven’t watched this one myself, I liked his sensibilities and viewpoints in the ones on ocean cruises I did watch, and you may, too. Or look for other YT sites more narrowly focused on river cruising. There are sure to be some.
Good luck.