Somewhat uncommon for a betrayed->strongest type of isekai, Yondome wa Iya na Shizokusei Majutsushi has the protagonist get screwed over more by passive neglect than active malice (though there certainly is some active malice in there from his past lives). Apart from that there’s not much to say about it other than his abilities are a bit too broadly defined and not particularly well thought out.
The third Shinigami ni Sodaterareta Shoujo book turned out to, against expectations, pretty much follow the lead of the previous two in being primarily combat focused (although in this case we get a look at a third army). It’s just as good as they are. What’s most interesting though is that in the Afterword the author mentions this should roughly be the halfway point… meaning they have an actual plan to conclude the story relatively soon.