The first step to become an bounty manager is you need to become an established forum member, people have to trust you whether the lower or higher rank you can do bounty management but you need appropriate skills.
In bounty management there or lot of works unless signature campaign the bounty have signature,social,tranlation and media campaigns and most the rewads are stake based so more participants will participate in bounties so yiu need to track all their progress weekly.
A bounty manager should be able to do many things, they are required to be able to do many things under any circumstances. Building a reputation does become important because it means capital owners will not hesitate to determine the best bounty manager. One example is yahoo, lutpin and atriz. They all do things and they make sure they can apply a good system in the bounty they manage. This is a thing that can not be done by everyone, therefore it is people who can focus who can do it and they will become a professional if they can manage various bounty well and consistently. Keep learning and show that you are a trusted person, it will make it easier for you to become a bounty manager.