After the battle with the bull beast, Atlas didn't immediately challenge another enemy. He left them alone and returned to the main palace where he could practice on his own.
After gauging his strength, Atlas deemed that combat wasn't what he needed at the moment. It was better for him to focus on himself in other ways.
He wanted to practice the Grand Arsenal, and he wanted to learn more about his own qi usage. For the next three months, he spent most of his time meditating rather than doing hard training.
He only stood up from his meditative position when he wanted to test the moves of the Grand Arsenal that he was learning, but even then his actions were like those of a puppet. He moved with precision and a lack of emotion that made him seem less than human, but through this kind of attitude, he was able to make the most progress.