I didn’t study in the US but I just finished university and one of the things I regret is not making more friends. I focused a bit too much on studying and didn’t bother taking the time to meet any of my classmates. That would have helped a lot now that I’m job searching.

I have no idea of how workload-heavy US universities are so I can’t give any advice on that, but one thing that could be general advice is: academically, you’re on your own now. Up until high school, teachers kinda hold your hand sometimes and can be lenient on deadlines and grading; well, in university that’s no longer the case. If you were used to not studying and getting acceptable grades like me, it could be a rude awakening when you realize how easy it is to literally fail, and I mean fail for real. Then, it’s easy to hyperfocus on studying and not socialize like my case.

I will also pass along a quote I read once before starting university myself: it is possible to graduate and not have learned anything. Which means, if you just focus on doing whatever assignment you have to turn in next or acing the next exam, you could end up with a broad but very shallow knowledge of most topics, which depending on your major, could be unfavorable in the end.

Hope it helps