You should have enough knowledge and insight into your unit's social media accounts to be equipped to decide where to focus your efforts. Look at each account's performance and audience, and look for ways to incorporate those accounts with your unit's command messaging. If there isn't a connection, or if the account is not performing well, consider focusing more on the ones that are and less on the ones that aren't.
You can reevaluate at a later date to see if more changes need to be made. The most important factor is to make sound decisions based on the research you uncover during your audit. You need to focus the most time and resources on the accounts that are strengthening the unit's message.