Reaching Diamond, could you give me tips?

I'm playing this game for about 2 years now, you could say I'm half casual and half serious about it lately. I don't main any champs, I'm all rounder, yet my main role would be mid as I barely have trouble there. I think I got stuck with the idea that I can't reach Diamond because I don't have a "xxx" number of games with a champ. I'm currently Plat 1 on promos 1 win 4 games to go. What should I do? I'm trying to get Irelia/Fizz for top but pantheon completly shutdowns my fizz when I first pick it, so only irelia left, but if they pick a nasus it could be trouble as he scales 2 much. For mid I pick Viktor/Lissandra/Orianna as they scale incredibly well late, I used to try main Ahri but I feel that her late hás become somewhat weaker. For Jungling I take Vi/Shyv as they seem really strong post mid game with devourer. My worst role would be adc. I won't try to go supp on these promos, despite being actually good at it. What do you guys have to say about this? What should I bring on my promos or do? :\ Third time on these promos and want it to be the last.
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