Your business plan is now complete. Imagine you are in front of a group of investors to present your business idea and encourage them to invest in your company.
Create a brief presentation for this purpose. 
Select a format:

PowerPoint with notes; no more than 10-12 slides
Audio over PowerPoint
Video presentation over PowerPoint
Storytelling (video recording)

Check out the Shark Tank pitches for ideas on how to create a brief but compelling presentation of a business: https://abc.go.com/shows/shark-tank.