We make this mistake all the time, don't make it again

Don't start jumping into rank right away. Firstly the meta is still shifting around and people are still not sure how to maximize what they have with the new changes in the patches(I still don't get how the new assassins work...) But most importantly, rank is now full of people hoping for a 10 win streak so they can get somewhere they do not belong, and trolls who don't give a f*ck about rank. Every year when I was pumped to rank right away I always get one or two of these players on my team, and this year it is a singed support who starts to proxy top, leaving the top laner with no EXP and bot lane 1vs2. It was a 20 gg game.

Just wait for a month or so, at least it is what I will do.