When Elon Musk acquired Twitter a year ago, he pledged to turn the social-media platform into an “everything app” that would eclipse what the long-struggling business had accomplished since its founding in 2006. One year in, much of Musk’s grand vision has yet to play out.

The company is struggling on a number of metrics, according to third-party data, including attracting users. It is trying to rebuild its advertising business after that revenue plummeted post takeover, and the platform also has been navigating content-moderation challenges after Musk loosened such rules.