Constantly Losing Ranked Games

Hi my name is Mantis God and I would want to share about how league has been treating me lately with constant losing in ranked. Last season I got to my series to Gold 3, and since the start of this new season, I have been doing nothing but dropping (Currently I am in Silver 2 but you get the point). As you can tell by the name, I am a main. I played Kha'Zix since the first day I played this game back when was released (bought him with rp lol) and I really had a bonding with him, though I do love a lot of other champions too. Now you might think I main him jungle, but actually I main him mid (I main mid lane by the way). That probably sounds like the main reason why I could be losing, but I'd say it is far from it. For me, this was what made me so successful. Though since there are some matchups Kha cannot take mid lane, I would then go a different champion that I know fairly well like , , , and even . I also main , , , and for alternative roles. Now to cut to the chase, every game I have been playing lately has just rarely ended out in a win, especially in ranked. It is either bad team mates, connection problems, or just getting plain destroyed fair and square. I came to the forums to ask for some help and maybe some tips you guys can let me know about to help me move further. Is maining Kha'Zix and the other champions I use a cause to why I keep losing games? Is it just bad matchmaking? Is it just the Silver elo? Is it bad luck? Please give me some help or tips. I love league very much including my favorite champions, but it feels risky playing them and any ranked game now. I do not feel confident like I used to, and games are much more complicated with so many champions to ban that are either good in the meta, or just a plain out counters to Kha'Zix (Like or that always puts me through a living hell xD). Again, any advice or tips will really help me out. Thanks a bunch :)