One of the first things you’ll need to generate gobs of great ideas is a Safe Environment. That means we need to have a place where EVERYONE can feel safe to share ideas without being criticized. (Even negative body language can be detected AND hurt the flow of more great ideas!)
In one brainstorm session, I left because we had one person cut down everything that was said. Others tolerated it but the Idea Flow slowed. After 15 minutes, we had nothing. I decided to leave the session and resume it later with team members who would encourage every idea.
That’s the first step. Good luck!