Always worth checking if there’s more libraries you’re eligible for, for the best selection - I’ve got a card through my local library, one from the next town over (I just need to visit once a year to renew), and a town in California (Sunnyvale) that gives library accounts to anyone who applies. Some libraries will do digital-only accounts for like $20/Year, so that could be worth looking into if your local library doesn’t support Overdrive/Libby.
What you think of as important may change over time, as well - with the solution as written, you’d need to decide what the “subject” is at compress time, but what if you later realise that’s the last ever photo of grandma, or the AI decides that you were wearing different shoes than you actually were. Worst case, you need to rely on some detail in a photo later, like to absolve you of a crime.