Writing is hard, but is it "Nintendo hard"?
To complete a difficult game like Mega Man, Castlevania, or Ninja Gaiden, you needed to play through each level over and over and over again, memorizing the patterns of enemy movements, finding power-ups, and avoiding traps (usually after getting caught in them a few times first). This takes a tremendous amount of patience and persistence, which are essential qualities for the hopeful writer submitting work to agents and editors. While I was playing all those NES games as a kid, repeating the same levels for hours (no save games! limited continues!), I was also unknowingly rewiring my brain for a career as a published author.
Getting a rejection letter can feel like hitting a brick wall, but it isn't game over. You have to get back on that speed bike, telling yourself that next time you'll make it. I came so close this time! I just need to give it one more try. Come on, five more minutes, Mom!
But as you pick up the rules, get better at writing, and persist in sending those queries out, you'll hone your instincts. Maybe along the way you'll find some warp zones and things that will shorten your journey or improve your chances of success. And one day, probably after numerous setbacks, you'll find the agent you've been looking for.