First of all, let me forward by saying that you will find no added benefit from playilng on a smurf in ranked at level 30. You might luck out and get placed decently high and maybe even get a good winning streak, but, in the long run, playing at what is considered a lower ELO will only hurt you. There is a very common misconception that it's a good move to give up on your primary account and you'll fly past it on a smurf, and, while there certainly is some possibility of this, you are more likely to climb up on your first account if you do a couple of things.
First of all, let me look at your acc on lolking.
55 wins to 64 losses. 46% win rate. As a general rule, you need to be above 50% to increase your ELO
Many challenger level accounts succeed by maintaining a 55% winrate.
Looking at your stats, of those 64 losses, a staggering 26 of 64 losses are on chamions you are either 0 and 1 on or 0 and 2. The thing to take away from this isn't, "you're Silver 5 because you're losing," but rather, "you're silver 5 because you are playing a wide variety of champions in a whimsical manner and just picking what you feel might work but in reality by spreading your champion pool thin you are hurting yourself."
For instance, you are 0 and 1 with Katarina with a 0/7/4 kda. You picked Kat because you think she's strong, but you probably went into the game with little to no Kat exp.
On the flip side, your LeBlanc has almost a 10/5/6 kda in over 12 games (which is still admittedly a small sample size). You clearly know your way around that champion.
The stat breakdowns are mostly to explain what I'm going to say next:
-You need to select a relatively small pool of champions that you have a lot of experience on and try to exclusively play those champions
typically, I recommend 15 champions, 3 per role.
Looking at your stats, a basic recommendation would be to only ever play:
Top: Nasus, Shen, PICKONE
Jungle: Jarvan, Reksai, Eve (assuming you are 3-0 in the jungle and not mid) [side note, you Lee is obviously under performing wherever you play him]
Mid: Leblanc, Talon, PICKONE
ADC: You don't really have many ADC games, and that's okay, it's easily my least played role too, but you should focus on being able to play one champion. Traditionally I recommend Caitlyn because she's super safe and, while you may not carry hard, you become less likely to feed and do poorly on. Plus she's off meta at the moment, and you dont have to worry about her being picked by the enemy usually.
Support: Blitz, Leona, Morgana. I know I picked a couple of champions you have quesionable winrates on, but you have to remember that we are dealing with relatively small sample sizes here. These are what I consider to be playmaking supports. Annie is unfortunately a bit odd in how she effects a game and many inexperienced supports actually end up flash Tibbering to their team's loss.
This is all speculation and should not be taken as law, but the important thing is to PHYSICALLY WRITE DOWN ON A STICKY NOTE OR SOMETHING your list of chamions that you will play and NEVER STRAY FROM THAT. It helps a butt-ton while climbing, because the number one rule in ranked is to
BE CONSISTENT
the second rule is to not play when you are on tilt and go play an ARAM or clean your dirty bedroom.
