I'm Immortal, Not a Deity

Immortality Masterpieces! Hand Them Over! Now!

Hand over all the immortal-longevity masterpieces! Self-nominate a book for my topic.

Immortality Novels: The Protagonist Lives Forever, Sees Through the Mortal World, and Witnesses Countless Human Relationships

Longevity Novels: Male-Oriented, No Romance, and a Protagonist Who Has Lived So Long That He's Beyond Worldly Attachments

The main thing is no romance at all!!!!

Longevity Stories with a Male Lead Who Has Seen Through the World, No Female Lead

It's me again. I'm looking for stories where the protagonist lives a really long time, is immortal forever, and has grown detached from worldly affairs. No female lead.

The Protagonist Is Immortal, Watching Everyone Around Them Pass Away One by One as Time Goes By

Lonely, with a lingering sadness after finishing. Ideally, something heartbreaking.

The Protagonist Is Immortal and Has an Air of Loneliness

The Protagonist Is Immortal and Witnesses Life and Death Throughout the Ages

Any Stories Similar to Immortality Novels?

Looking for books similar to The System Grants Me Immortality; I'll Eventually Become Invincible by Staying Alive (Eternal Embers). There's a novel where the protagonist transmigrates from the start and ends up trapped in a small town. The people outside keep waiting, and one of them even dies out there. Does anyone know the title?