Need some friendly advice

Im one of those players who never cared for ranked gaming. I was more of a waste some time on ARAM and normal Rift kinda guy. The first time i got the game in season 3, I instantly played ranked whenever i could and got into B5 cause i was shit.

Through the next seasons I never played more ranked then the placements, sometimes a bit more. But like u guessed it, dont play any ranked ever, stuck in B5 forever.

Now this season 6, I wanted to change my game. Im determined to play ranked and keep on playing, win ore lose... I main support. Mostly Tahm and Thresh, but occasionaly Brand for funzies, depending on enemy adc / support. Obviously win ore lose 10 games, id still be B5.

Now here is my question. During placements i got a bit upset on how the other B5ers talk and go afk when they go 0/17/3. They usually give away first blood and instantly flame one and other wich results in a loss cause nobody cares anymore. Except me. I dont care for the placements, I just want to have a good time and try get up the ladder on the way.

So again my question: How do I, as a support, help keep my team being motivated throughout the game. Im the guy that keeps everyone calm and just wants to play a fun game, who learns from others throughout the game, not the guy thats stressed out cause he dies once or twice.

Im not asking how to get out of B5, ill manage that on my own thank you very much, Im asking for tips to settledown the B5 team i get.

Thanks a lot for taking your time to read this thread and any tips you give.