I see you were in Iron last season (and finished Iron 1 with 100 LP, so almost Bronze 4). The champions you play are not the issue, but how you play them (which includes what you build on them).
In your most recent game you played 
, and built 
in that order. And you were laning vs 
. So you you likely play in a very defensive, passive style and have a strong preference to building defense.
My advice is to play one champion every game in top lane, in ranked SoloQ, until you get good at them. So either play something you like in general so you do not get tired of playing it quickly. Or if you don't know or feel you can manage to stick with whatever champion, then play 
who does very well while building defensive items when played properly. And keep playing that one champion, whoever you settle on, for a few hundred games at least.
You can look at lolalytics.com if you are not sure what items, runes, and/or summoner spells are good for the particular champion you chose to play.
I also see you play lots of games versus the intermediate bots. And you consistently smash them. The biggest difference between them and going against players is after playing large numbers of bot game, you have got good at predicting what they will do. But you are not as good at predicting players of a similar level to yourself or players that are above your level. At this point to improve you need to play against players, and playing against the bots is at best a waste of time in terms of getting better.
When you play, focus especially on playing the laning phase well. Don't worry about the later parts of the game until you can do well in lane in the vast majority of your games. Once you can do that then you can learn how to press your lead to get your team into a game state where you are most likely going to win. Then once you consistently well at that transition you can start focusing on how the close out games you should win without throwing.
Do also look for game play videos or streams to see how other people play. Speaking of, I have recently been up loading recordings of some of my ranked games to Youtube. Most of the current videos are mid lane (which I played a lot of in pre-season), but I primarily play top lane and will be uploading more top lane videos soon as I finish preparing them for up loading. I know I don't have any comentary in the videos, but if there is anything in them you would like an explanation about leave a comment on the video(s) and I will try to get around to answering any questions.
