Reviewing the game stats you only had 6/31 kill participation. Seeing as your mid went 16/3, adc went 9/1 and your top went 9/4, I wouldn't put too much weight on this victory. Also, only 8 wards in a 24 minute game? That's a little below average and generally tells me that you were clearly steamrolling their team, or should I say your lanes were steamrolling them.
I am not discounting your victory, you are probably a really good player, but one game, especially on where you do not seem to have been a key component to the victory, does not tell us much.
Also your normal mmr and ranked mmr are not always similar. I often get matched against silvers and bronze players in normals even though I have a low-mid plat mmr in ranked. Normals are kind of a poisonous place to get data from as there are too many variables to account for, like when people try new champs or play roles they are not familiar with.
TLDR: I'm sure you're a great player and have a lot of potential BUT one game isn't enough to go off of, especially one where your kill/part is so low. Normals are also not a great litmus test for your elo range and the two queues have separate MMR systems.