My podcasts have been on iTunes for over five years. Now some are not showing up on Apple podcast app search

I can subscribe manually to your feed and all the episodes show. However the iTunes link doesn't work - I get 'cannot connect' although I checked with my own podcast and both search on title and the iTunes link work. So it looks as if your podcast has been removed from the Store.

Obviously I have no way of knowing why this would be. I can offer a wild guess, that the term 'Greatest hits' in the title has triggered someone into thinking it's a 'mix' of copyrighted music, which from looking at the feed evidently isn't the case (though I haven't listened to any episodes to see whether they do in fact contain any music).

You will need to contact Support. Go to https://itunespartner.apple.com/en/podcasts/overview and click the 'Contact Us' link at the bottom of the page.

I can't even try to help you unless you post the URLs of both your iTunes Store/Apple Podcasts page and your feed.

I did say the bit about the title was a wild guess. I'm afraid I can't offer any further suggestions - obviously I don't have access to your dashboard.