Anyone have some tips on how to motivate a team that is losing/feeding, instead of being toxic?

Hello everyone, I am coming to the boards to ask for some advice. I have gotten 3 accounts banned before due to toxicity, and with no doubt all of them were well deserved and I am well aware of that. I am on this new account hopefully doing better, but the last 2 games I have gotten with a bot lane that had lost early. Once they had given 3ish kills I was okay because sometimes people get bad start, or just have a bad game. This is when (in one of the games) an Ashe would continuously go bottom and die to an ADC Sona. Then she would run straight into a Tryndamere and die, she ended up 0/11/0... The next match it wasn't the ADC this time but it was the support purposely running into Blitzcrank hooks as I watched her do it, plus giving around 6 kills by 15 minutes (Not counting the ADC).

After my lost games, I am getting tilted and turning back into a toxic player by flaming. I really want to do better but it really gets to me when people intentionally feed like that... I have hard time ignoring it and I have come to ask for some tips to not get toxic. I don't want to get banned again so I am asking so I can learn before another perma-ban!

Anyone have some tips on how to motivate a team that is losing/feeding, instead of being toxic?