Even if you think the topic has been done over and over again, there'll be people out there that wanna listen to the way you ask the questions.
Paige Elmore’s advice is “podcasts don’t grow quickly overnight. Focus on your content and on your audio quality”.
Be careful, it could be that you are spending a lot of effort to get people into a community that they don’t necessarily want to be a part of.
As Hugo says, “always ask fewer questions than more questions, and know where you want your episode to go”!