I didn't know much about this one going in besides the basic premise (follows the wanderings of an elf mage in a fantasy rpg setting years after her party of adventurers defeats the Demon King and returns peace to the land), a handful of recommendations from folks, and that it's currently getting an anime adaptation.
I really enjoyed it though. It's very beautifully melancholy in the way that Frieren drifts through the world without much personal attachment, only to run into repeated scenarios of disconnect in seeing the people around her who she's grown distant from over the decades age and fade away. It all feels very true to the experience of being a dreamy, dissociated space case, and it's very elegant the way that this experience so naturally arises out of Frieren's elven lifespan but is also deeply human. Yes, as an elf she hardly feels affected by the months and even years as they slide on by and so it's natural for her to let them pass without notice, and yet a millennia-long lifespan isn't the only reason one might experience such a thing.
It's just as easy for those of us with shorter lifespans to let the time glide on by without ever truly being present in it. In times in my past due to deep depressive dissociative spells it's certainly felt easy to feel like an timeless being drifting aimlessly through existence, hardly feeling the months as they slide on by, and it's simultaneously painful and wistful seeing such an existence given perfect, romanticized form in Frieren herself. Yet even as she herself has no shortage of time to idle away seeking the most mundane scraps of magic, the world around her doesn't pause. There's a certain allure in her being able to idle away months and years seeking out a minor spell to remove rust from statues, but even though she can afford to face life with aloof indifference, is she really happiest doing so?
I also really love the character of Himmel. He's the central hero of Frieren's adventuring party whose passing away of old age decades later sets off Frieren's current wanderings. At first it's easy to take him as a bit of a golden fool (early flashbacks show him hemming and hawing over how best to pose for an adoring statue), however repeated flashbacks show him as someone with a deeply-rooted love of the world and life itself, from which all of his heroism stems. His example inspires the group's selfish and corrupt priest to later in life take in and shelter an orphan, and although his example doesn't quite reach Frieren as deeply, repeated flashbacks show him constantly placing his faith and trust in her to find roots of care in the world. Trusting she'd return to a village where they'd sealed away a demon near a century earlier to finish the deed and ensure its safety, even just mundane things like having faith in her capacity to enjoy the beauty of a sunrise even while she protests about the inconvenience of waking up early and maintains a sense of distance and superiority.
If Frieren's natural impulses are to constantly distance from the world and retreat into a safe isolated existence of magical study, Himmel feels like the embodiment of the draw of love, connection, and meaning, and it's really satisfying seeing Frieren slowly warm to extending roots into the world and (cautiously, uncertainly) finding things to begin to bind herself to life around her and move out of her solitary bubble.
