what's your strategy to make friends in college?

I would like advice on a system/strategy to make friends (as an introvert)

currently, i try to:

- smile and acknowledge people I know in hallways
- I try holding up a conversation with people
- I strive to be a normal human being

however, I still find trouble with making friends. I'm not close with orgmates, classmates, and I would appreciate advice of how you personally did it.