Starting from the City Lord, Build an Immortal Dynasty

After traveling through time and being reborn as a member of a cultivating family, how can Su Yuyu, who is gifted with low-grade spiritual roots, survive in this world of cultivating the weak and the strong and establish a huge Immortal Dynasty? Using a remote town that he manages as a starting point, he uses modern knowledge to create a civilized society where science and technology cultivate immortality. Bullets and flying swords fly together, and technology and formations collide. (No system, writing about cultivating immortals and farming)