I'm a support main - i can tell you now you have no idea what to build on any of the supports you currently use. And after you get sightstone, you should be selling your trinket for a lenses. I have no clue why you would keep your warding trinket every single game. And you should building based on what your facing. Your just randomly building wayyy to much mr or armor when you don't need it. Plus, you've bought the wrong boots every single game. You should never be buying the white boots you keep buying, and the cdr boots are very situationally built for leona.
With that zilean, you shouldn't have both a gaunet and zhonyas like that. Zhonyas is a decent item later on, and gauntlet you'll almost never build on him.
Lastly, you don't use your wards nearly enough. The only times you won't have that many wards placed is because your not dieing and having to stay in lane a lot to keep pressure. Even then, you should average a ward every 1:20 or so. You placed like 12 wards in 36 minutes.... or 15 wards in 29 minutes... xDD
I say this stuff not to be mean but to help. I'm bronze as well and know how hard it is. The difference is I've figured stuff like this out, and I play at a near-gold level now.