Cultivation towards immortality, starting from being a fisherman

in a multiverss similar to earth, while playing a fishing game on his windows XP computer, he transmigrates into a cultivation world. He joins a cultivation sect but he only has low-grade spirit roots, and after 20 years he is still only at 3rd Qi gathering, in despair he gives up and requests to manage a mortal city, to pass the time in his new life, he goes fishing and is shocked to see the fishing game transmigrated with him and is his golden finger. The game and reality are in parallel existence, he can see into the parallel fishing world, when he cats his line it travels into the fish world, other see him catch nothing and look at him in pity fishing for hours and cat hingnjothing, until he wills the fish to pass through worlds. He can trade the game fish for items, one of the items return to location of birth delights him and teleport back to save point so he can return, it's time to go back home, what is this a cell phone? What they colonized the moon and there is even a tower that connects directly to the moon? a space elevator from Earth to the moon! I will trade goods and buy resources, I know Sugar, I will trade Earth sugar for spirit stones, gold is worthless to,cultivators but they love eating sugar, hmm people might notice all this gold, I need power, I know, Earth has rats! I will be the Rat Taoist, Earth beware my army of rats.