I had absolutely no idea that there was such a disparity in listenership. I thought I was on the low end.
Maybe I should be the one giving out advice.

I am just looking at trying to increase my listenership. My audience varies dramatically on holidays and weather. Weather, of course, affecting internet connectivity.
About half of my listeners are local, within my region of Southern California. So I do spend some effort rationalizing the news, weather, and conversational bits. I try to keep the other audience members involved with little contests, (hardly ever any prizes, just recognition).
I have several link connections. I register at every place that offers a link to my station. There are hundreds out there.
I make a big deal out paying music royalties. Being here in Southern California I get a lot of submissions from new artists. Recognition as a Royalty paying station is important in this area. I get a lot of listeners through the local recording studios. By playing some of their artists I get publicity in their blogs.
I just recently got listed on a hard-list (hard encoded into their internet radio listings). Ocean Digital lists my Internet station directly in their impeded "Featured Stations". I am trying to get a deal worked out with them for promotional consideration.
I have 3 major streams. I run three encoders from my SAM software. Live365, and two others with a total of 1000 slots. It is the one I started with and have many listeners there.
I report to a couple of countdown services, that gets me a lot of listeners and recognition.
All this to say, I work hard for what I have. My station sounds damn good. I listen to it on Alexa and it Rocks.
https://live365.com/station/World-Mix-Inet-a37384My years of radio give me programming expertise that is quite the snag for listeners and business networking. I do interviews with artists, local business people, too. I am also considering picking up a laptop and doing a two hour remote from local businesses and restaurants. As soon as this COVID-19 thing clears up, that is a project.
I want to do local sports broadcasts. I have already done a couple to work out the kinks. That is fun and grabs a lot of listeners on a long term basis.
The bottom line, it takes work. There is more, but I do not wish to bore anyone. I just want to hear about what others are doing. If we can get a little dialog going it can help everyone. So let's go.