I Need Ranked Answers/ Advice

So pretty much I'm kinda stuck in a rut right now in ranked, but am curious to how I got there, so imma post this to see if any of you guys might be able to enlighten me

Alright so lets set the stage: Last season I managed to climb to high plat maining mid lane mages and almost made diamond by the end of the season, but reflecting upon it, I noticed that my map awareness was awful, I didn't often have a game plan, never thought through optimal trades and positioning, and overall was not the best, but perhaps a bit better than I give myself credit for.

My current situation has me in Gold I just demoted from Plat V with Silver I mmr (according to our wise friend op.gg). Since around winter 2016, I noticed large losing streaks with maybe a win or two sprinkled in between as if trying to cheer me on every so often. Not surprisingly, not much cheer was to be found. Regardless, I have upped my play a lot since both last winter when the win streaks started, and actively strive to improve in many aspects of the game I feel that I lack in- yet I still find myself losing a lot, and unable to pass Plat V, even despite the fact that I am playing smarter now.

I definitely have bad games, in fact the last ranked game I played, I did not do so hot, but majority of the time I tend to play my lane well, and sometimes come out ahead, but mainly neutral and typically farm well. But since last winter, I have been feeling as if my teams have been letting me down a good amount. Most of the time it is through dying repeatedly, but there is a decent amount of negativity and giving up involved too. I have noticed that the enemy team often gets first blood and for some reason I rarely see my side of the map actually stomping or at least winning their lane. I have also tried roaming and impacting the map but I have also noticed my teams tend to actually start dying before I can even hit like level 5-6. I guess it really does sound like I am blaming my team for a lot of my loss, and I suppose I am, but honestly I'm not sure if its the main problem. I guess in the overwhelmed and frustrated state I am in now, it certainly feels that way and to my knowledge, majority of the time my team does tend to do less than average in game. Lately it really feels really hopeless and that I won't be able to attain the former glory I once almost had in my grasp.

But that is exactly why I have come here. I need some outside opinion, opinion from players better than me that I can use to improve or at least understand my situation and find a solution.

Now, the questions: How did I manage to get stuck in this endless loop of loss? Can my absent minded play being rewarded earlier and efforts to improve and work harder being met with failure be attributed to bad luck/ unlucky teammates? What might I still be doing wrong? Is there anything I can fix? Can I fix my situation?

If any further input, information, or just anything I can provide to make things easier when giving an answer, just tell me I would be glad to cough it up. I really feel confused and stuck so ANY advice and answers to the questions above would really be appreciated.

I main mid and currently frequently play the following: TF, Anivia, Orianna, Malz, in addition to Azir and Viktor, both of which I have not been using as much (especially azir im pretty sure hes like not doing so hot rn).

Thanks for the help, -DarkMagyk60