Harry would likely rely on his friends. Hermione could help him with the organization and planning of the ranch, like making sure all the animals have proper shelters. Ron could assist with the physical labor, like building barns or corrals. Together, they make a great team to manage the ranch.
He probably uses magic. For example, to water the plants, he can use a spell instead of a regular hose. And to fence the ranch, he might use a charm to create a magical barrier that can keep unwanted animals or people out.
Perhaps Thestrals. Since Harry can see them, he might have taken in some Thestrals. They are strong and rather mysterious, and could be useful for carrying heavy loads on the ranch. Also, they would add an air of mystery to the ranch.
Well, he might manage his daily life by relying on magic for basic tasks like cooking. He could use spells to clean his place and keep it tidy. Maybe he'd also use magic to grow some food in his small garden if he has one.
In some fanfictions, Harry might use extremely powerful and ancient magic. Maybe he discovers a long - lost spell during his adventures that has the power to reverse death. For example, he could find a spell hidden in a forgotten corner of the Hogwarts library that was created by a powerful wizard in the past but was deemed too dangerous to be used.
Harry would manage his company by bringing in people he trusts. He'd hire employees based on their skills and character rather than just their magical abilities. He'd also make sure that his company has a positive impact on the wizarding community. For instance, if it's a magic - related product company, he'd ensure that the products are affordable for most wizards. He'd listen to the needs of the customers and adapt the company's offerings accordingly.
Perhaps he uncovers some major corruption or inefficiency in the Ministry. So, as a result of his efforts to reform it, he is given control. For example, if he finds that the Ministry has been misusing magic for personal gains, he could lead a movement to take it over and run it in a more just way.
He might have discovered the island during one of his adventures and claimed it as his own. Since there was no one else on the island at the time, and he was the first to set foot on it and recognize its potential, he decided to make it his property.
Maybe he inherits it. In the wizarding world, there could be some old family connections or a will that passes the ownership of the bank to him.
In some fanfictions, it could be through powerful magic spells that he discovers or is taught. Maybe he stumbles upon an ancient spell in the restricted section of the library that allows him to summon a family member. Another possibility is that he unknowingly activates some kind of magical artifact that has the power to bring a sister into his life.
In many fanfictions, Harry might use his powerful spells like the Stunning Spell or the Killing Curse if the story allows for such dark magic use. He could also use his intelligence to outwit the dragon, perhaps finding a weakness in its armor or behavior pattern and then using a well - timed spell to defeat it.
Well, in some fanfictions, Harry might use a super - powered Patronus. His Patronus could be stronger than usual, perhaps due to some newfound magic or a special connection he has developed. It could be so powerful that it simply overpowers the dementors and destroys them.