Try Tailwind. Create an account, join several communities, repin their pins, and get repins from them.
Also, you can try to join the so-called Pinterest superboards. These are boards with more than one member. If you post your pins to superboards, your impressions rate will grow immensely! That's because superboards have many members, and all their followers see and repin their (and your) pins. The trick is that some superboard owners are reluctant to accept new members, yet far not all of them. Give it a try!