SCM Demand Managment - Options to improve forecast accuracy

We are looking for options to improve our forecast accuracy. We were set up with the Bayesian Forecasting to generate a "best fit" for all of our materials.

1 - The forecasts are not calculating high enough to even cover the shipment history records. It should see either an average or even trending in the direction of the history provided.

2 - The forecasts are all the same load shape. The forecast patterns for all 4 examples have virtually the same demand curve for completely different product hierarchies.

If you have any questions or have ideas for improvement, please reach out. I would love to discuss opportunities for improvement.