I have a project in which im trying to predict future Crypto/Stock prices based on historic prices. I have made an ARIMA model for this exact purpose. though is seems like the prediction chart goes flat after about 3 or 4 days of future price prediction. Im a beginner in AI models in Python. I had speculated that the model may be overfitted, but after asking someone i know that is somewhat an expert in building AI models, he said that it is very rare for an ARIMA model to get overfitted (since its a Time Series model). he also said that if the model was overfitted the chart would look like a parabolic chart.