Demand Forecast from Historical Data Prompt

Help me build a demand forecast.

Here is my historical data:
[PASTE YOUR DATA — monthly or weekly sales/demand figures, with dates]

Context:
- What I'm forecasting: [e.g. unit sales, revenue, leads, support tickets]
- Time horizon needed: [e.g. next 3 months, next quarter]
- Key factors that affect demand: [e.g. seasonality, marketing spend, sales headcount]

Please:
1. Identify any clear trends, seasonality, or patterns in my data
2. Provide a baseline forecast for the requested period
3. Give me a range (conservative / base / optimistic) with reasoning
4. Flag the assumptions I should stress-test
5. Suggest what additional data would improve forecast accuracy