"Bad luck streak"

Here we go again. win streak, lose streak. I have played ~200 games in platinum this season, staying around 50% winrate overall. This keeps happening: win streak, lose streak. Not so long ago, I won 12 ranked in a row. I failed promo to plat 3 4 times. Then, recently, I lost 9 out of my last 10 games. Went back to plat 5 0 LP. The one game I won, I was 9% kill participation, I almost did nothing expect get 2 infernal drakes and get first blood.

But the other games, most lanes feels like it's like Silvers versus Diamonds, every single game. laners keep dying 1v1 in lane, get out-cs by a lot, etc. I don't know how to call this... "bad luck streak"?

Anyway, I am waiting for the "good luck streak" now, since the system forces you to be 50% winrate, it will come as usual.

I wish that, instead of "bad luck" and "good luck", the MMR system actually built fair games, so that win or loss actually reflect your play, and so that the game gets enjoyable instead of free win / free loss boring games.