Ore no Zense no Chishiki de Teihenshoku Tamer ga Joukyuushoku ni Natte Shimaisou na Ken  

The Useless Tamer Will Turn into the Top Unconsciously by My Previous Life Knowledge.

In this new world, after an unfortunate incident led to his death and subsequent rebirth, Varius discovered that his previous profession as a Tamer in another realm was considered of low status here. Despite this setback, he utilized his past experiences to enhance his creatures' abilities, regaining his former dominance. With his newfound strength, he aimed to embark on a journey as an adventurer. However, he soon encountered challenges that tested his resolve.