The best way to make friends (in my opinion) is from experiences.
I've met most of my best friends from playing in-game or trading in the past.
Lame standards like "you must be this level and not be banned" are really bad.
Just be open-minded because your worst enemy can become your best friend.
A public profile would help but if you don't want to do it then don't.
You just do you, and you will attract people who like you for who you are.