Get involved. The more you participate in the groups, forum and site activities the more visible you become to others members. The more visible you are to other members the more the more people will take interest in you and take interest to learn more about you.
Talk about what you know, what you do and what you like and people will naturally gravitate to you and may ask you questions, engaging in conversation and make friends.
Say hello to someone, welcome new members, respond to posts, give encouragement, support, post new topics, blogs, events, Ask questions, look at member profiles, find people to work and collaborate with. Talk about your goals and dreams. You never know who might be on a similar path or may offer encouragement or find someone to work with or help.