I have an idea about service board and maybe I can get many big campaign managers from there but what I am trying to know is whether there is any other way to get campaigns apart from service board I have seen many managers have no post on their service board yet they run continues campaign.
How are they actually doing the job?
I assume very few / no managers asked this question (how to become a manager) with a topic are now providing their service as a manager. I wanted to tell you that to become a manager need a lot of experience, need to know how the forum works, and how the bounty/signature campaign works. What are the things done by a campaign Manager.
To achieve this knowledge and experience you have to know the forum well. You have to spend a good amount of time here. Need to join in the Bounty and signature campaign to understand the Manager's tasks well. Once you enroll in some bounties/signature campaigns you can understand it easily.
Let's talk about how the campaigns come to the Campaign manager. Most of them come from their Ann thread and direct contacts with the project team( but in this case, experience and portfolio play an important role).
On the other hand, you are talking about the campaign managers who don't have their service ann thread even they are newbies/brand new accounts. Yes, you are right, the newbie is also now a campaign manager but I am pretty sure they are running campaigns with alternative accounts who have experiences but previously lost their reputation.
Long story short-> spend time here, achieve experience and gain knowledge so you can easily understand how to become a campaign manager. Best of luck.