How am I suppose to build Azir late game?

I've been playing this son of a shurima for far too long and I get amazing games where I'm the carry but whenever I have to push objectives to end the game, I find myself the only person ever doing it (I'm Silver) , and I usually do amazing with knowing what to build until the very end when everyone has their build, which is usually when I can't do anything with the other team consists of cc that scales with levels and it's long enough to get me killed. (You can't dodge a fiddlestick's Q)

Anyway, I'm wondering how I build Azir at the very end of the game. I know the very core on him as my first 3 items, but when both teams are even in objectives, I'm at a disadvantage because split pushing is so difficult when you're so squishy and you have to do it yourself since no one in this elo really knows when to take objectives unless someone pings it. I build RoA for early sustain, Nashors for the consistent DPS, and Liandry's if they have a bunch of people stacking health items but not magic resist, otherwise I build Void Staff. This is so frustrating to play and I don't know if he just sucks with absolutely no peel, or if he falls off at the very VERY late game (according to champion.gg) . I'm absolutely useless without a tank, and when my team, which isn't as fed as I am goes with me, they all die before I can kill one threatening target. (REMEMBER THE CASE OF AOE CC)

I'm asking what should be my last two items as an APC this season, I've seen some Platinum Azir mains who build as their last item because Azir is just too squishy, especially against people who build attack damage. (He has 70 Armor at Level 18)