I just came back to LoL need tips for Ranked

So its been a month since i came back, ive only climbed from bronze 5 to silver 5 but im struggling right now, i try to not range and i can play every role. How do you guys deal with people who gives up easily with just like 1 kill or people who tend to rage or something. Also how about when you have a team mate who keeps making mistake flaming everyone that it's team faults how do you guys deal with those? I dont really know what to say when i say something like come on man chill they're just gonna be like stfu because i really want to win, im fine with losing but i dont wanna lose because one of my teammates acts childish towards something that's not too major which basically throws the whole game away. I also know that blaming isnt a good thing when trying to climb but having like 3 teammates feed i don't think that's possible to carry and ive had them alot idk if im just unlucky with matchmaking.