Hardstuck in gold

I have been playing since season 2 and I have been stuck in gold for 4 years. I am in a very hard losing streak. I went to gold 1 then demoted to 3 .I am asking any tips to pass gold. I play nasus and Darius I mostly chase.my enemy team down half the time im facing a ranged team with heavy cc on everygame with great late scaling. What should I do?
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