title: Machine learning project - my target variable is not evenly distributed in time
body: <p>I´m working on a machine learning project where I try to predict, what clients will buy a specific product (buying the product is my target variable). I have plenty of features about the clients and enough historical data. 
  My issue is that my target variable is highly seasonal – most of the product is sold in December, other months have only little sales. 
  What do I have to do, to compensate this imbalance? Does the target variable need some adjustments? I need the model to have consistent performance across all months. Thanks</p>