It didn't necessarily need it, but I feel like Brooklyn Nine-Nine could have got to double-figures if it weren't for the horrifying real-life events that understandably made everyone a bit queasy about their cop comedy.
I would happily watch more Pacific Rim: The Black, Netflix did so little promo I can't tell if it was cancelled or 1 season was always the plan, but given some unearned beats in the back half I'm guessing it was cancelled. That was really good, a far better addition to the world than the film sequel (which nevertheless actually sets it up).
Three that were cancelled but given wrap-up films that I would happily have watched more of were Wu Assassins, Sense8, and Timeless. The former got lost in the Netflix churn - a martial arts tv series with Iko Uwais, Lewis Tan (a fan-cast Iron Fist), and Lagertha from Vikings should have got more attention - but was actually pretty good. The film is...there. Action is solid (but vfx undercuts a one-take fight scene), plot barely-there, and the director appeared to soundtrack it himself but was still a fun 90 minutes. Sense8 was very ambitious and likely expensive, if it had gone 3 seasons Netflix would probably have ran out of money. One of these shows that seems to have a bit of every genre mashed up into it, and - although I haven't seen it - a far better use of Wachowskis than revisiting The Matrix.
Timeless meanwhile...well it was the previous project of The Boys' showrunners so you know its good! At times a procedural (so American Doctor Who?) where Peep Show's Johnson used money from the illuminati to build a time machine, they kept the conspiracy thinly-sketched enough that the wrap-up didn't feel too rushed. 3 great leads too.
I'll stop this accidental essay by finally saying Altered Carbon was also done dirty by Netflix, behind the obvious cyberpunk aesthetic was a well-realised world with great performances by the 3 playing the lead (the lead actor changes each season - Joel Kinnaman in the first, Anthony Mackie! in the second, with Will Yun Lee in flashbacks) that could have ran and ran, switching up settings within its world and lead actors each season.