Well, my "friend" said content is a king, backlink is a queen. I agree with the others that you need to have good content and update it periodically. Soon or later you will have traffic coming to your forum. cmiiw
When you will create a profile with complete details on the forum and add a signature link when you need to go for a discussion on that platform then people will visit your profile and signature link and through this way, you will be able to get traffic from that forum.