Need some advice to reach diamond (CLOSE)

As a bit of backstory, I have played about 88 ranked games this season (Started about a month ago) I am currently 54 & 34.

I main Orianna, my winrate with her was about 70% till I am currently in platinum 2 it is getting harder and harder. I think I am down to about 64%.

I lost my series last night into platinum 1 =(

Top is also my second best role.. I am 8-1 with Irelia.

In season 4, I reached platinum 1 playing aggressive laning champions like Fizz & Syndra.

After they were nerfed since then, I dropped them and tried to pick up something new, so I chose Orianna. Orianna is a great champion don't get me wrong, but sometimes I feel like she is not such a great champion for solo queue since I am so used to getting kills in lane and being super aggro which the passive Orianna playstyle is hampered if your top or bottom lane gets destroyed because you rarely ever "destroy" your mid-lane opponent.

Do you guys have any ideas/tips? I am super close to diamond and I would love to finally reach it. I thought about just spamming Irelia, I'm not sure I have enough time to learn a new mid laner and ranked my way up =(

Thanks guys I appreciate it