1. LOOK FOR COMMONALITIES

Think about the people you've been the closest with. I'm willing to bet that you shared values, goals and interests. When you have things in common, liking increases drastically. When you talk to people, share what you like and dislike and see if they do too. Make sure the commonalities you identify are MANY and STRONG.

2. INVITE THEM TO JOIN YOU

Once you've figured out MANY STRONG commonalities, it will naturally make sense to invite them to activities you both enjoy. Why Many? If you both just like running, you'll have made a running buddy, not a friend. Why Strong? If you both barely care about jazz music, it won't be compelling enough to go to a jazz bar together. It's not necessary to go just the two of you, but the fewer you are the stronger the connection is going to be. Of course, the activity can also just be meeting for a coffee and talk.

3. START HANGING OUT REGULARLY

The more you hang out, the more it'll become a habit, and you will have made a new close friend! That's why you want MANY commonalities because it'll make way more sense for you two to see each other often and thus forge a stronger bond.

Hope this helped! What do you think about commonalities as the main driver to friendship?