Fanfiction.net is also a great place. There are many talented writers who post their HTTYD - related fanfictions there. Look for the sections related to the How to Train Your Dragon series and specifically for stories centered around Hiccup as the dragon master.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of HTTYD fanfictions. Just search for 'Hiccup dragon master' and you'll get a bunch of results.
The best chapter pointer here is Chapter 217, "No Problem, They're All Red Anyway". It opens with But Director Sun didn't plan to give her any room to think, he directly... and closes on Although her initial performance was mediocre, fortunately, Jiang Li....
Look to Chapter 238 for the clearest answer. It begins with Jiang Li was actually first on all three leaderboards?!, keeps building through Could it really be that outrageous?!, and lands on And, to Zhou Xu's alarm, they did find a problem..
A practical answer is Chapter 266, because it turns the idea into a concrete scene. The chapter opens with Upon hearing this, the deputy director's expression also turned serious., adds pressure through Take me to her right away." Just as the cameraman was about to explain, a..., and ends on Now I.
Chapter 208 is the strongest chapter-level answer because it starts from Jiang Yan clicked his tongue, "What's this about money? and follows through on Seemingly sensing the raging fire in Su Yinwan's heart and feeling....
Look to Chapter 210 for the clearest answer. It begins with This was Zhao Lang's first public appearance., keeps building through He was dressed in a set of black and white local attire, with a simple..., and lands on Clearly, she used improper methods to get it..
Chapter 219 is the strongest chapter-level answer because it starts from Qi Tianyu was somewhat freaking out. and follows through on Having any yield at all was already the show giving them face..
The best chapter pointer here is Chapter 219, "Five Thousand Jin??!!". It opens with Qi Tianyu was somewhat freaking out. and closes on Having any yield at all was already the show giving them face..
Look to Chapter 259 for the clearest answer. It begins with While the villagers of Chixia Village were all immersed in the revelry of..., keeps building through The man with the scarred face led the team, constantly remaining highly..., and lands on It wasn't that he was scared..
If you want the clearest chapter reference, go to Chapter 219. Early on, Qi Tianyu was somewhat freaking out.; later, the chapter leans on The eagerly anticipated bed of roses had turned into pink roses..
A practical answer is Chapter 220, because it turns the idea into a concrete scene. The chapter opens with I know everyone has many questions, and I'm here to answer them one by..., adds pressure through Carrying the heat surge of his research topics, he instantly shot to..., and ends on However.