What Should I Do After Reincarnating into Another World and Practicing Sword Training?

Monsters are rampant, ghosts are rampant, and humanity is gradually failing. Fortunately, the human race is constantly striving for self-improvement. Two human monks joined forces to kill powerful demons and evil spirits, which brought ten thousand years of peace to the human race. Now that the human race has no great monks and the monsters are eyeing them, what should the human race do? ... ... As an outstanding civilized young man of the 21st century, Lan Tian accidentally slipped and transported his soul to this weird world of immortality while helping his old lady cross the road. Since this world chose me, I will take revenge on this world. Lan Tian thought to himself, senior brother, be careful... Before he could finish his words, a mana blast hit his head...