How do I improve?????

hey guys, Iv been playing lol for a year or so and im still REALLY bad. I play quite a lot, watch vids on how to improve and use sites like and to see where im going wrong/item builds ect. I thought I was doing ok for a while and nearly got promoted to silver then plummeted down to bronze 2 in a day. I main support and ADC any tips on how to improve would be much appreciated!
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