For whatever reason most of the comedy in KonoSuba doesn’t land for me like 100 Girlfriends does.

That do be like that sometimes. Entertainment is subjective; humour even more so.

Kazuma isn’t very likable, he just seems selfish and gross.

He is. IMO he follows the trend of anti-hero protagonist who behaves like a dick (e.g. Deadpool). I can see why people dislike him.

I dunno, maybe I’ll get back to it at some point.

Personally, I hardly give dropped anime second chances. I don’t have a lot of time, but there are so many anime out there. Every minute I spent trying to make it work is time I could have spent watching another show, anime or not. Or reading another book or manga, or doing something else in my life.

I’d imagine it’ll be the same for most people. Of course, if we have all the time in the world, it will be a different story.