Do a roadmap. Fixed scope small project that you get paid for where you define requirements. Deliverable is a functional requirements doc. It derisks the project for them, and gives you more confidence when quoting a fixed scope fixed price project. You just don’t guarantee timeline. I’ve been doing it for over a decade - it works wonders.
What is the total cost of these projects and how much are you typically charging for the requirements doc?
I'm skeptical that most of the clients I work with would go for something like this. Generally my projects are in the $7k-20k USD range (though with some clients the total spend is much greater with additional phases of work...)
Also, what do you mean "you just don't guarantee timeline"? Why not?
