This, and also: adoption of the American 4-year undergrad system. Maybe make it five, idk.
There's a lot about American educational systems (plural) to be desired, but the fact that you don't have to declare a major until year 2 is a) sort of unique, globally speaking, and b) much more forgiving than entering a 3-year program you chose when you were 17 and getting stuck on a single track forever.
It also allows (and even, through gen-eds, requires) students to explore things outside their target major - to take classes that have fuck all to do with that major and plug any gaps in their high school education. And don't try to tell me other countries don't have those gaps; I lived and went to high school in Europe, and I promise you, there are always blind spots.
Example: my freshman roommate and I both entered university planning to do the same major and taking the required courses together, as well as a few gen-eds (general education credits) and electives separately. By the time we graduated, I had stayed in the International Studies program, gotten an English lit minor, and taken a bunch of Medieval history and anthropology courses I thought were cool. She had switched her major and got a degree in graphic design (at the same university). The system gave us that flexibility to change our minds.
Ten years later, I'm doing my PhD in Europe, where Bachelors programs are 3 years and you apply to a program within a university, not the university itself. And my god... say what you want about Americans, but at least universities make it easier to become well-rounded humans. Here, you are absolutely railroaded into a very narrow paradigm. Critical thinking and analysis are abysmal, because if you're doing a bioinformatics degree, no one asks you to examine the themes in Oedipus Rex or understand the complex political situation that led to Hitler's rise to power. And you develop a worldview that is so unbelievably myopic that you can't even imagine that other people are also smart and that other disciplines also have value. And so you get whole-ass adults -- full professors! -- who are not only experts in one single thing (expected), but don't actually know anything else. And refuse to believe it's important. Because they started studying engineering when they were 17 and that's literally all they know.
It's unbelievably damaging. It needs to stop. Yes OP, yes absolutely, give every Bachelors student a do-over if they want it. But also introduce gen-eds to the Netherlands because it's real concerning out here.