HOW DO I DO IT!!!????

Posted a link to my match history, Am i doing something totally wrong?? I been really working on my mechanics of the game and just my overall gameplay. i spend tons of time practicing CSing against BOTs and Humans both. Most of the time i finish positive as far as KDA which i know doesnt matter much but still. How am i still losing ranked matches? I guess i dont understand how im playing with Silvers and Higher bronze players in Norms but in ranked im stuck way down deep in Bronze 5. As a Solo Que player idk what else i can do to carry a game??? I guess im just frustrated and prolly tilted. But there has to be a better ranking system then just depending on a team of random people to actually help....