As you’re meeting all of these people in your life and career, always keep in mind how you can help them. You should practically meditate on it before contacting them.
Someone you know is just who they’re looking for. Some resource you’ve got would make their day. There’s always favor you can do.
An article you read in this morning’s news might be of particular interest to someone you met last summer, so look them up and send it to them. A film/TV music supervisor might mention she’s getting married and is looking for a reggae band. You don’t do reggae, but with your database you can help her find a great band that does.
Maybe you spent three weeks shopping for a laptop. Maybe a booking agent you met today mentioned that he’s looking for a new laptop. Email him the best info you found.
Give give give, and sometimes you will receive.