I'm not in the podcast industry, but I'd listen to this episode of Darknet Diaries: https://darknetdiaries.com/episode/27/ https://darknetdiaries.com/episode/2

I'm not in the podcast industry, but I'd listen to this episode of Darknet Diaries: https://darknetdiaries.com/episode/27/ https://darknetdiaries.com/episode/27/ He dives into "podcast promoters" that are pretty effective at getting into the top charts. I mention this not because I think you should use these services, but because he actually gets some evidence around what the charts are based off of. It's also a great podcast in general.