your last 2 games and that ashe game you had some pretty good stats. I am not the best and don't know what happened in those games without watching a replay or what rank your teammates were but I am surprised you lost. My guess is even though you were ahead and had good stats you did not push your advantages as much as you could have. Granted, your teammates may be to blame as well. My guess is everyone got focused on fighting and kills too much instead of trying to take objectives.
I guess my suggestion would be keep up the kda and cs as your stats doing well for low elo but focus on getting more objectives. What I mean is look for opportunities to split push and take turrets rather than just going for kills. You have to find that fine line of split pushing enough and focusing objectives to help your team win the game but not too much where you are never with your team and always dead due to overstaying or doing unsafe pushes or getting caught in the late game.
Hope this helps? lol.