Forecast data range is not close to history data

As shown in attached pictures, the green line is history, the red line is demantra generated forecast. I use 90 days historical data to generate further 15 days forecast. we can see from the picture, the forecast data range is not close to the history data. For example, the min(history)=1, the max(history)=5, and the min(forecast)=2.3, and the max(forecast)=4.0. Is there any setting or parameters we can tune to make the forecast data range close to the history.  What I want, for example, the forecast, in picture 1, is exactly the same as their history data, from 1 to 5, up trend.