It’s A Place Further Than The Universe for me, both the first time and the first rewatch. Absolutely phenomenal series.
Also Violet Evergarden. Went from not caring about anime at all to a favorite pastime, and also rediscovering my emotions in the process.
None. They are just anime but many many that have just brought a new dimension to the art. To many to count honestly. I would have to muse for quiet awhile. frieren, something like and my eternity, cells at work, and overlord are a few recents (recent for me. I have been off anime for awhile.)