If a big company believes that buying you could lead to them owning the panic button space, it could be worth a lot. Otherwise, it's probably close to $0.

Your biggest danger is spending a lot of time chasing deals and ultimately selling for close to $0 and having to work for the acquirer for a year or more. In that case, it'd be far better to pull the plug now (which you can do by all quitting) and move on to the next project.

More advice is at https://justinkan.com/the-founders-guide-to-selling-your-com...