What should I prioritize in Shopify inventory forecasting for growing DTC brands? ?

Hi guys! Our sales have been a bit unpredictable lately, and relying on basic spreadsheets to guess our next purchase orders isn't cutting it anymore. A buddy in my mastermind group mentioned using this Shopify inventory forecasting for growing DTC brands here https://www.neonpanel.com/inventory-forecasting/shopify. I really like that it automatically factors in vendor lead times and seasonality so you don't accidentally over-order and freeze your cash. Has anyone here personally tried their forecasting model? Just want to get some unbiased opinions before committing to another SaaS subscription.