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I am trying to forecast values using ARIMA for 14 day data which is in a 5 minute interval [4032 values], the data was stationary hence i plotted seasonal decompose and trend was downwards, moved forward with acf and pacf and got 13 and 5 as values for p and q, split train test as [3000:1032] and trained the model, while predicting the values are coming in straight line, I'm unable to figure out what is the mistake, attaching the plots for reference...the value for freq i gave is 288 [24h*60min/5mins

Selected 13 and 5 as values forecast plot

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