I Became a Tree in a New World

I died and became a tree. In the middle of a large forest our protagonist wakes up after years in a daze, the only thing aware to them being a loading bar filling up. Slowly they lost all but vague memories of their last life. At 100% they wake up and find themselves in a weird forest as what seems to be something like a willow tree. Prompted by a mechanical system they figure out the they have become a newly born world tree in a world filled vast amounts of strange creatures.