Post details of your system + likely others might provide unique perspectives related to your question...

Such as other markets you might access.

To an extent, your type of service will determine your TAM + SAM. For example, a pure software system can target every DCC (day care center) anywhere in the world.

If you have a hardware component, like webcams, then likely you'll have to only target your local area as you'll require installers.

Clarify your system + likely you'll receive some useful assistance.