Trying to get back to Riven

On S1 I mained Irelia / Janna and got the gold, it was fine. On S2 and S3 I mained Riven but at high play I had to go full support to get something done, and dropped Riven. Since then I usually went Supp and ADC, until I got back to TOP Irelia, since a bunch of ppl are not used to play against her, so they don't fully understand her.

But damn, Riven is really fun to play, and I really wish to get back with her, with this new event, I really feel like I'm missing out on not playing her.

I have no idea what to build on her or what hard counters her (since I dunno what is she really good against, unless Season 2-3 knowledge works...)

So basically nowdays I rush Death's Dance, and after that I'm lost lol... I max out Q and then E. Masteries and Runes I take priority on CD, and that's about it.

Hope someone can give an insight. Yeah, I play since S1 and still gold player, because each season I usually just want to take the victorious skin and then take a break from the game. Also, I'm not on Plat lvl of play.