I'm determined to make the audio quality of my podcast better than just average. Can anyone help me out?

Hey there, so I have a small podcast and I'm proud of the content, but I'm not satisfied with the audio quality. I've spent all the money I can on microphones, pop filters, cables, headphones, soundproofing and interfaces but the quality of my podcast is not up to par.

Anyone have any recommendations? What I think I need is a course on mixing and mastering but all the youtube videos I watch, either A) use logic or pro tools which I can't afford or B) aren't made for podcasts, but for mixing music.

Help a podther (that's podcast+brother combined) out.