Hi Sarah, welcome to FBF
I would always advise businesses to attempt to retain enough capital to avoid using overdraft facilities, which are costly and risky.
Alternatives that you may wish to consider are either taking a loan which gives you more control or selling a stake in the business to raise the capital you need to see you through those times of the year....better to have some of something than all of nothing.
There could be further options such as reducing any credit you offer or negotiating longer credit terms with suppliers, but without knowing the cause of your need for the overdraft, such advice could be premature or unsuitable.