Build ready-made Notion workspaces — student planners, small business trackers (inventory, sales, expenses), content calendars, budget trackers — and sell them as duplicate-able templates. This is popular globally (especially with US/UK buyers who pay in USD via Gumroad or Notion's own template gallery), but also has a growing Nigerian market for small business owners wanting simple, free-tool-based systems to track their business. Once built, a template sells indefinitely with zero extra work per sale.