How to get from the hell?

Hey guys, I'm in trouble. I am gold 5 but I'm losing almost every game and I could be demoted soon. For the win i get only 13 points. I am not bad player, last season I was almost platinum and I'm trying so hard. I'm trying to be posivitve all the time, to encourage my teammates, but.. I'm loosing all the time, for example I win 1 game and lose 5 and I dont know what to do more. I'm trying to play different roles, different champions but everything is useless. So please, do you have any advices for me? Appreciate.
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