Seems channel tags have no character limit, you can essentially have as many channel tags as you want, so where I'd normally avoid broad single word tags, in the channel tags, I don't see it as much of an issue.
So just a loose example, I see you have "politics" as a channel tag, and also "podcast" as a channel tag, you could easily also have "politics podcase" "political podcast" "podcast talking about poltiics" and then if you have "rock" and "music", why not add "rock music" "rock music discussions" "talking about rock music" "talking about rock" "talking about music" "discussing rock music" there's literally an unlimited combination of words and phrases you could use, and unlike video keywords where you need to make the most of your character limits, you go as much as you want.
SILTHW mentioned how there was a time for some creators where there was a 500 character limit. I never experienced this limitation, so if you have the opportunity, make the most of it. But when it comes to celebrity names that you've interviewed, I WOULD recommend you putting the context... so if I interviewed steven spielberg for example, I wouldn't just use his name as a channel tag myself, I'd instead go "steven spielberg interview" "interviewing steven spielberg" "interviewing spielberg" "talking with steven spielberg" etc, and this is also where you can use the keyword research tool, and add all your findings into your channel tags.
I'm not sure if there's any way to see how channel tags specifically effect your channel, Andrew or someone else might be able to speak to that more, I'm still a student of tags and keywords, but if you have no character limits, take full advantage of them, because every little bit of SEO data you can add, you might as well add if you can.
