Making friends isn't that difficult, it just requires a bit of trust and sacrifice from you. If you want to make new friends, you can start by going to social gatherings; bars, hangouts, conferences depending on what type of friends you want to make.
Talk to these kind of people, find out what they like, ambitions and try to connect with them in a way they can relate to.
Get their contacts.
Keep in touch with them and make sure anytime you do that you always seem valuable, like you have something that will help them to get to the next level.
 Hope this helps. Cheers!