I’m not sure I understand the question.
Not sure about the meaning of “the goal” as compared with “your smallest possible goal.”
I could send an email to a few people right now and say “Send me a donation and I’ll start sending you my program.”
But I’m not sure I can deliver the program under my current circumstances. Not sure I’ll bring in enough money to stay afloat. The future seems so uncertain. I don’t want to promise something I can’t deliver. I guess I could say “Whenever I receive $X I will start delivering,” where “X” is enough to create stability and predictability. Don’t know how much “X” dollars is. (I’m not a competent businessman. I’m looking for someone to tell me what a “businesslike” decision is.)