For me, you have two of these backward. You say do your research by going to linkedIn. Then later after you set up the interview you say to listen to the pocast.

If you want to get on a podcast, listen to the podcast and when you contact the host connect the dots on how you can add more value like the value on (episode number). I get SO MANY requests to be on my show that proves the person:
1. Has never listened to my show
2. Does not convey how their information will benefit my audience.

I mentioned this in an episode about interviews on my show. You have to do the work, but in the end, doing the work upfront leads to better interviews in the end. Would you rather be on 10 podcasts where you have your target audience or 100 shows where you message falls flat? I do agree with connecting with the host (LinkedIn or other means) but be ready to prove you are a fan of their show.

The other thing I thought you forgot is if you plan on being on 90 podcasts, BUY A DECENT MICROPHONE (and by that I mean NOT A BLUE YETI). Something like the Samson Q2u (Which is less than $100 and plugs directly into your computer).
A good microphone will make you a favorite amongst podcasters (as so many people want to use the microphone in the camera or laptop and both sound horrible).

I loved your section on giving back. I wish more guests did that. Those are great tips and will lead to your being asked back again, or removing many hoops to a second interview on the show.

Nice job.