First Booking Flop with Podcast Booking Agency Outreach

Landed my first podcast booking through a cold email to a podcast agency, but it was a total disaster wrong audience fit, no follow-up leads, and I wasted hours on prep that went nowhere.
If you have tried podcast booking agencies or platforms to get booked on podcasts, did they help filter for better show matches, or did you still end up with mismatched invites that did not convert?