Don't quit. Validate your idea first, then implement it.
Read "Nail It Then Scale It" and "The E-Myth Revisited". You'll save time and money. You might also study business strategy (free courses on Coursera) so you can evaluate your idea from business fundamentals first. The more you can invalidate it (no market, massive incumbents, no demand, too costly, etc.), the less time and money you'll waste building something nobody wants, and the better placed you'll be to spot a truly great opportunity.
As a developer it's natural to focus on your strengths. You need to validate ideas before doing that.
Read "Nail It Then Scale It" and "The E-Myth Revisited". You'll save time and money. You might also study business strategy (free courses on Coursera) so you can evaluate your idea from business fundamentals first. The more you can invalidate it (no market, massive incumbents, no demand, too costly, etc.), the less time and money you'll waste building something nobody wants, and the better placed you'll be to spot a truly great opportunity.
As a developer it's natural to focus on your strengths. You need to validate ideas before doing that.