All of these are solid opinions, and I agree with them.
The active protagonists is a big one. I completely agree that a lot of stories, especially those written by more amateur writers (younger me had a bad habit of doing it myself) tend to, like you said, have everything happening to the protagonist rather than the protagonist themselves taking action and affecting the story. The protagonist needs to actually be important to the story for anyone to want to follow them. Plus, making the character have to face the consequences for their own actions can be a lot of fun when you write it correctly, and definitely makes the plot itself grow more interesting in my opinion. So I completely agree!!
And as for killing protagonists— absolutely, if it's done right. I don't like stories that just kill protagonists for the sake of it, but I do like it when stories kill a protagonist the right way and show the readers that none of the characters are as safe as they'd like to think. It makes the action and high-stakes situations actually feel like high-stakes situations, and to me, that's awesome. The Walking Dead (both the TV series and graphic novel) is a good example of this in my opinion, because so many characters that nobody ever could've expected to die are killed throughout the series (which characters depends on which medium, but both show you that your favorite characters are never safe). While it sucks that my favorites always end up dead, I also kind of like not knowing for sure that everybody's gonna make it out okay. It makes me more invested in what's happening and what could happen, and makes me genuinely afraid for the characters. And, since I know the writer is capable of being an absolutely menace, it has made me more invested in the characters in Invincible too because I'm like— crap, how do I know if these secondary characters I'm so invested in are actually gonna survive? I remember what he did to (no spoilers even though everybody who's gonna see it probably already has) in TWD so I'm not about to pretend like I'm trusting him while watching Invincible either. Plus killing off the main protagonist can be a great way to set up a different, unexpected character as a new protagonist, and let the dead protagonist's legacy sort of guide them, "passing on the torch" if you will, which I think is a cool way to write a story. So I agree and totally wish that more writers would utilize killing off protagonists. Raise the stakes!!