1) Scope often (at least once a day)
2) Give some value in your scopes
3) Connect with others by following them, watching scopes, giving hearts, and being present on live scopes (comments). Also, be constructive and not a bully or as they are called in Periscope world a "Troll" because you will be blocked.
4) Reciprocate hearts and follows as much as possible because this will get viewers to follow you back as well as come back again and again.
5) Be consistent.
6) Join a support community for Periscopers. This will get you follows and hearts fast!
Here is the replay of my Scope: