Demand Forecast from Historical Data

Help me build a demand forecast.

Here is my historical data:
{{paste_your_data_monthly_or_weekly_sales_}}

Context:
- What I'm forecasting: {{e_g_unit_sales_revenue_leads_support_tic}}
- Time horizon needed: {{e_g_next_3_months_next_quarter}}
- Key factors that affect demand: {{e_g_seasonality_marketing_spend_sales_he}}

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

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