Data is divine, and can help when forecasting. Use sales analytics and proposal tracking to see what's worked and what hasn't. Optimize and revise!
The “Metrics” System: Leveraging Sales Analytics
5 Sales Forecasting Metrics That Actually Matter
Proposals vs Sealed Deals: Measuring Sales Performance.
You need to optimize your sales and lead generation processes: the current performance and with hypothetical changes, and everything starts with measurement.