Ultimately, I think the only important thing about writing is enjoying the game. That's like faith, or being in love, something that only one knows. It is something pure that comes from your heart, and while that happens, I assure you that there will always be someone willing to read what you write.
Because, as other colleagues said, there are no formulas that guarantee success. The only thing you can do is your best and most honest effort, and be true to what makes your heart beat and lift it as you write. Because if sometimes tears roll down your cheeks while you write, I also assure you that someone somewhere will also get excited when they read it. And that is the key to everything.
Remember that first day when you discovered that serene beauty.