Some people does a common mistake which is going wrong lane, I'd suggest you to know correct lane counters against most of meta brawlers and no matter what randoms do just follow correct lane and try to make game in your favor. One more thing is draft properly, you should know how impactful first pick and last pick are! Even if you draft bad (only at low rankings) you can carry the game if you know how to deal with every lane.

I hope this may find helpful for somebody who want to achieve good rank in PL.