Rank

I been playing rank so often, to grind my self to platinum for this season. Why is it hard, why do I end up with team that need my help, when they can't even help them self. I play Illoi often to forces all enemy top, so I can help my ally farm and push too. I manage to take enemy first turret , I mage to win farm by 30 or 50 farm and guess what my bot lane keep feeding often. Alright I lost I understand, I'll go jg this time to help my team, and guess what I keep losing LP when I try to earn them. Setting 40 min in game to lose 20 lp when it I try my best to carry for my team to just run it down. I don't blame no one, sometime I get mad and tell them what they did wrong, but I understand I need to let it all out so I can progress next match. Again and gain. I am not blaming no one I try my best to fit the role my previous team could manage, but guess what some other role need to mess it up: if it's not bot its top, if its not jg its mid and so on and on. I'm so mad that I am even disappointed on my self. From gold 2 to gold 4 ......this is harder when you take the blame as well, your team didn't play right, guess what " no one care,you are taking blame for it" that is how I see it. I just wanted to be platinum. Make my self happy seeing me I advance a big achievement. I don't know how rank work and I would like to know more., is there even possible to know if "this is my right team" . I don't want a perfect team, I am not asking for team mate to carry me, I just want to improve as well. If I don't derive to be in that platinum guess what. I do!! I don't care if I keep losing just that I lose to much LP. Take the fought for afk, toxic , feeder team. I just want to be platinum this season. is there any way I can improve, do I need to stop playing rank for 2 days ? do I need to stop taking that same champion ? do I need to flame my team ? do I need buy loot ? just helping to improve better team and I try to communicate many and many time I even tell them where to place their control ward. ( hiding next to a bush where you can see enemy jg buff) makes more since warding enemy buff to know what side the summoner leashing his buff. If he at his red team can know where enemy jg will gank soon. Bot or top depend on the side you are on.