My podcast doesn’t show in searching results

If your feed is properly constructed (which as it's in the Stor I assume it is) there isn't really anything you can do. The Search process is opaque and none too reliable (and I should add that keywords, if you have provided any, don't work any more).

You could try contacting Podcasts Support but I don't honestly think you'll get much of an answer. Go to https://itunespartner.apple.com/en/podcasts/overview and click the 'Contact Us' link at the bottom of the page.

Just looking for podcasts in Spanish will bring up a number of podcasts, so many that yours is likely to be lost in them - I got 100 results and there are likely to be many more - I don't know how many, of course, but there are many thousands of podcasts in the Store so there must be quite a lot in Spanish.

As I don't know the actual name of your podcast I can't comment any further, but on the whole the Search really only works reliably with the actual name.