Let me tell you a story of my most recent streak.
I play since season 2 and i am a silver. I never put myself immediately intor anked and all over these years, while i got a great lot of knowledge and experience over many matters, i felt i still played with the mechanics of a sloth.
One day, due to a series of things like picking a champion i resonated well and making good decisions and flashy plays i managed to get from silver 3 to silver 1, reaching the promo to gold.
I failed the promo 3 times, every time doing worse and worse. I got pissed by that and i forced my way into promos again, resulting in poor plays and making em fall to silver 2.
That is not good neither for you nor for your ranking, and i decided to pause a bit, doing only normals to keep myself trained but without exausting myself, and i dare to say that worked pretty much well! You don' t have to lock yourself too much into rankeds else your judgement, your cool and your prowness falls hard.
... , then i reached silver 3 due to a massive amoutn of afkers and trolls like i have never seen in 3 years and lost promos crashing the client on champion pick, but that si an other matter >_>