It simply hasn’t been long enough. I wouldn’t necessarily bet that it will, but X has lost net users and Bluesky is gaining them so if trends continue (they might not) Bluesky will overtake X, but Twitter also wasn’t built in a year.
Do you have a source for this? I thought Twitter stopped releasing user stats when Musk took over. One thing we do know is that yearly revenue is plummeting: https://www.demandsage.com/twitter-statistics/