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, 俺の前世の知識で底辺職テイマーが上級職になってしまいそうな件

As a result of an unfortunate incident, Varius passed away and was reborn into a new world. Upon arrival, he discovered that his previous profession as a Tamer was considered low status in the current realm. Drawing upon his past experiences, he devised innovative ways to enhance his creatures' abilities, regaining the supremacy he once held. With this restored might at his disposal, Varius aimed to embark on a new journey as an adventurer. However, there were challenges that awaited him.