This business is starting to find its stride after a major disruption.In the five years leading up to its all-time high in January 2018, Carnival (CCL -0.42%) was a winning investment. Its shares jumped 86% during that time.It's been a different story since then, though. This cruise stock currently sits 80% below its peak price. That's even after shares soared 76% since the start of 2023 (as of April 18).Does this setup on the dip make Carnival a once-in-a-generation investment opportunity? Here's what inve ...