Be more active!
Student organizations play a huge role in your success as a student, and as a successful job finder.
It’s not enough to simply to say “Hey, I was in group XYZ in college.”
What you want to be able to say is “I was a leader in my community through my active part in XYZ at the Big Conference, the Walk to Save Lives, and the Students Cleaning Parks events.”
See how different those two statements are?
If the resume building reasons aren’t enough to convince you, then do it to make friends! Do it to learn from peers!
Whatever the reasons you choose, just do it. Be active.