for 1 dont duo q. Unless you're smurfing duo Q is like a 50/50 chance cause MMR gets higher which means your team is "weaker" then the other team meaning you and your duo HAVE to carry.
You should always have 1 pink down at all times and maybe 1 green.
Don't play 10000000 champs. PIck 2 champs for every lane and master them. It can get boring but thats how you climb the ladder.
Don't be negative and or blame your teammates for mistakes cause it won't help you win.
Trolls happen.. afks happen.. my main is diamond 2 and its just as worst as it was in bronze sometimes only difference is people in diamond can CS better lol.
Unless you are pro or just unreal at this game it might take you 500-1000 games to climb to the next tier.. I came to terms with that after being gold for 2 seasons in a row.. then finally hitting plat.. then finally hitting diamond..
Listen to good music ( helps me from tilting if i make mistakes or my team is playing bad )
Watch streams, read guides, lolcoaching.com is a really good place to find a higher elo coach who can teach you the lane you want to learn or get better in some you have to pay for and most are free ( i have done this for support, and i am now a plat elo support player woo.. lol )
without seeing a VOD i can;t really tell you anymore then that but hope it helps bro