The Reincarnated Elf Left on a Journey to Master His Magic and With His Extra Lifespan Became a Living Legend is a Manga/Manhwa/Manhua in english language, REINCARNATION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

This the long tale of a reincarnated elf who become a living legend! After his ordinary life came to an end in an accident, Minoru was reincarnated as an elf who have a average lifespan of 1000 years. Due to the regret of not being able to do anything in his previous life, he decided to leave his village and travel in this life to leave behind evidence that he once lived in this world . However, the head of the elf clan imposes a certain trial—!?