Getting out of your comfort zone is usually a great way to become better.

Traveling to another city or country has, in my view, a huge return of investment in terms of personal growth.

Also, remember that uni is much more than just knowledge transfer. You can actually learn most things for free these days. Going to university connects you with like minded people, and these connections can be incredibly powerful to your personal and professional growth. Many companies were founded by people who met at uni.