The value predicted by Prophet did not change much

hello everyone
I am using the prophet model to perform anomaly detection on the metrics of prometheus
However, I found that the yhat of the metrics output by anomaly detection is basically stable at around 0.6, and does not change with the original data.
The figure below is the predicted metrics versus the original metrics in grafana
Green bar is : node_load1{instance='192.29.3.11:9100'} (origin metrics)
yellow Bar is : yhat.
Orange Bar is :yhat_upper
Sky blue bar is : yhat_lower
Red Bar is : anomaly
It can be seen that the value of yhat does not change with the original value, but is stable at around 0.6

The original training data is like this:
model.plot_components(forecast)
model.plot(forecast)

How should I adjust the prophet parameters, or is there any other way to make Prophet predict the value accurately？
please help me