A very good story. Very intensive and dense, leading to reading more slowly. Spelling mistakes are minimal, at times sounding french (Ogdon for Ogden), at times just WTF (dollar sign used for Pound Sterling).
I found it hard to follow at times (although I believe the fate of Umbridge being an afterthought was done this way deliberately, following Harry having it only as an afterthought). The author mentioned in an A/N at the beginning their loss of finger dexterity, leading to writing only one paragraph at a time, and this shows in places where the knitting together could have been better. I briefly found myself overwhelmed from mapping the various OCs’ names, backstories and actions (if you do this, better do it well, and with the previous sentence, he cannot do it well enough any longer, sadly). Sometimes, the wording was barely comprehensible. Therefore, only four stars.
3.x★ – A number of clever ideas both magical and in the intersection of magical and muggle, with a Harry who prevents "Vold War II" before it starts. He thereafter is free to direct his ambitions (and galleons) toward becoming a private-practice Healer-&-Doctor who will offer his services to anyone who needs them, regardless of not just blood status or financial means, but also which sentient species they may be. My "content warning" is for a whole bunch of desperate-self-defense deaths in Little Hangleton Cemetery, right in chapter 1, with the rest of the fic being oriented toward his coming to terms with that event, and toward learning (including non-human-magicals' methods), political strategy in the wake of those now-empty Wizengamot seats and such, business/career planning for himself and friends, etc., i.e., "low-conflict". The goblins eagerly assist change, including keeping secrets for best benefit of their agenda. The proofreading is decent, the most common error I recall being a number of missing commas. The style, however, namely frequently very short scenes from a variety of PoVs, proved less gripping for me; YMMV. The pace was somehow both a bit implausibly fast (Harry and Hermione begin not pre-med but actual medical school part-time during their final (reduced-classroom-course-load) years at Hogwarts, with advice and assistance from the Drs. Granger and various Hogwarts staff) and a bit slow (not that I really should complain about greater realism in developing and spreading an expensive, highly-experimental treatment, but... 🤷). Also, as a romantical (and demisexual) person, I wasn't thrilled with the sudden casual-friends-with-benefits beginning of what evolved (without much said on-page) into a more-committed Harry/Susan Bones. It's not a big enough thread, though, for me to even shelve this as romance; Hermione, Remus, and an OC potioneer, for example, have bigger roles than Susan. I found the depiction of Hermione fairly balanced, neither ignoring nor magnifying either her flaws or her virtues; Ron rather drifts apart from them and all their study-focus. Basically, I certainly don't regret reading this, and I quite like some of it, but I'm not filled with "That was so good!" glee.