Tips to improve ? (I swear im not crying xD )

Hi, so I was wondering how I should improve my gameplay and my mindset. I have been playing League since the start of Season 5 and in Season 6 i think, I actively started playing ranked games on a daily bases. I haven't really been able to improve much over the couple of years, and it gets quite frustrating. Since the beginning of the year i havent gained any elo, although ive played 600+ ranked games this season alone. Clearly my mindset isnt right, does anyone have any suggestions for improving in ranked games ? (I dont blame this on my teammates or anyone else then me to make that clear)
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