'How do I increase my series out of data range

How do I increase my series out of data range I would like to forecast in future using Tensorflow Structural Time Series

forecast = tfp.sts.forecast(model = model,observed_time_series = y,parameter_samples = samples,num_steps_forecast = 24)
predictions_tfp = pd.Series(forecast.mean()[:,0], name = "TFP")
predictions_tfp[:2]


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