Write a story that takes place in a world where time travel is possible, but only accessible to a select group of individuals

Write a story that takes place in a world where time travel is possible, but only accessible to a select group of individuals. These time travelers have the ability to change events in the past, but at a great cost. The protagonist of the story is faced with a moral dilemma when they must decide whether to alter a significant historical event for personal gain, knowing the potential consequences of their actions. As they navigate the complexities of time travel and the impact of their choices, they must ultimately come to terms with the power they hold and the responsibilities that come with it.