"Learn to dodge" is really a horrible bit of advice given what I have seen in your match history.
I see that you aren't just "trash", but I also see a huge problem: You have some serious deficiencies in your last hitting. If you are only getting 70 CS in a 20 minute game, 139 CS in a 36 minute game, or even 117 CS in a 42 minute game, you are not getting the job done. You are going to stay silver for the immediate and foreseeable future with such abysmal last hitting. It doesn't matter how many kills or how many assists you grab on assassin champions like Ahri and Fizz, if you aren't getting gold from the creeps, you are going to be severely destroyed. Even in the games that you have actually won in ranked, you have been carried by your team because your ability to earn gold is crippled without reasonable CS.
One thing that many low Elo summoners don't really understand is that if you can control your minion waves with good, strong CS ability, you can keep pressure on all of the enemy's towers. You will gain objectives much easier. You can push up your ward lines past the river a lot more safely. You can set up picks in the jungle while the enemy team has to defend their turrets from being taken down by minion waves. If you are roaming (as many good mid laners will do), it means that you need to get as much gold out of your minions as you can before you push them into your enemy's turret. The better you get at that, the more pressure you put on their mid laner to keep up. Work on your CS and own your lane. Dominate the late game by using your gold advantage from last hitting to outscale the enemy. To climb, you need to carry your games instead of being carried.
Another observation is that you never upgrade your trinket. This means that you are constantly at a vision disadvantage and probably don't view this as high of a priority as you should. I didn't go into the detailed match reports on any of your games, but I'm pretty sure I don't need to. If you're not buying pink wards, using your yellow trinket consistently, or upgrading your trinket to allow for wider spread vision, you are never going to climb. As an assassin, it is in your best benefit to have vision of the enemy when they split from their team. You can use that advantage to get the jump on the enemy and pick them off to give your team more pressure on the objectives on the map. Vision is king in this game. If you don't worship the king, you are going to lose and lose a lot.
My last bit of advice is that you can't hold your standards to what your teammates are doing. If you're focusing on how your team is feeding or dying, you are less focused on the mistakes you are making. You need to win your lane, win it hard, and then look at the other areas of the map that you can help out in. Don't roam when you are behind. Look at the item builds of the other lanes before you decide to roam and be sure that you can give an advantage where you are going to. Don't feed the other laners a kill because they have stronger items than you and your teammate. If you focus on your own play and how you can use your own strength to force the game, that's when you will start to carry.
Good luck on your climb.