<s>[INST] There is a running time series data of a particular process. You have developed several models to predict the short term forecast of this process. The goal is to accurately forecast the short-term outcome.
The data has the following characteristics: The data shows all classical seasonality, namely: misspecification of seasonality can lead to suboptimal prediction, contains multiple seasonality, time varying means and variances, and forecasts need to be up to 4 periods ahead.
Given that you have already decided to use an ETS model, what should be your next steps?[/INST]