A good analysis involves careful segmentation of the truly addressable market and thoughtful descriptions of how customer segments will pay for the solution over time to build up a picture of realistic market size.
Bottom-up Market Size = [# of Customers] * [Price They’ll Pay]
Who is your specific customer? How many of them are there? How many of them can you realistically reach? At what price will they buy? Then, perhaps the most challenging: How many will buy from you?