As others have said, try to stick to a smaller pool of champions and roles. From the looks of your OP.GG, you seem to do best with:
Marksman: Ashe/Xayah
Mid: Annie/Veigar
Support: Bard
That's at least 5 champions to be able to maximize your potential on, and should prevent you from being pick/banned out. Nearly all of them are incredibly viable in solo-queue as well.
-Ashe brings the initiate and is a hyper-carry team-fighter later on. She provides very valuable vision for her team as well as a safe poke.
-Xayah is a very safe ADC with her Ultimate being able to survive things that most ADC's should not, and her feathers are a pseudo-Kalista rend with a root.
-Annie is always an amazing initiator, and is a staple for newer players to get the hang of things. She's easy to farm with, kill with, and is moderately safe.
-Veigar brings the pain as well as control with an AoE stun. Being infinite scaling means he's in a similar boat to Nasus: you'll never get outscaled by items end-game.
-Bard is a play-making support that does ridiculous amounts of damage in short bursts. His Ultimate is game-changing, being able to stop Dragons, Barons, Towers, anything you can think of. He also brings incredible safety with his E being able to teleport his team through walls and bait others. Being able to heal and scale infinitely (to a degree) is just icing on the cake for him.
You buy Control (Pink) Wards, this is great! Keep doing this, I can assure you that there are at least 50% of players stuck in Bronze that don't buy a single one - EVER. This is a huge plus for vision as well as denying the enemy team vision. You can also bait with it, and be able to sneak objectives with one around as well. You also mostly upgrade your free Trinket at level 9, keep doing this on champions that have an advantage on this! As an ADC, your positioning is your life, and stepping one inch too close to that bush with a Pantheon begging for you to face-check it is often certain death. The Farsight Alteration will allow you to face-check from relative safety, as well as lasting an infinite duration (if nobody kills it). For a Support, you'll often want to grab a Sweeper's once you've gotten a Sightstone, as this allows you to deny the enemy vision and doubles as a stealth and trap spotter for your team. If the enemy only has 1 Ward down to your 4, they're much more blind than you are, leaving you far more access to their jungle - and more importantly, their base.
Your CS is okay for your level, I'd always encourage stepping it up if you're able to, as Gold will allow you to hit powerspikes sooner and be able to carry games harder and faster. Aim for 8-10 CS/minute if you're in a lane with dedicated farm, less is totally fine if you're roaming around and making use of your time, but if you stray too far away and get greedy for kills you'll find yourself in a tough spot going back to base with little to buy. Remember that 15 CS is about the equivalent of a kill, so if your laner is 45 CS up and 2 kills down, they're effectively 1 kill ahead of you in Gold.
Try to steer clear of "feast of famine" champions. Gangplank is super fun once he gets going, but he requires a VERY large investment of time and Gold to even be remotely useful. His Ultimate is great, but very few people will let you get to the point where you're at 6 items and taking 90% of their HP with a single barrel. In a similar trope, try to stay away from "I need a team" champions. Someone like Galio requires immense team backup or he's self-suiciding with his Ultimate. I main Rek'Sai, however I wouldn't dare bring her into a game where I feel there is going to be a lack of synergy or follow up. Sometimes you'll have to feel it out - if your Riven top lane locks in Ignite/Exhaust as Summoner's Spells, she's probably not going to be any use to the team and will be looking to pad her KDA and boost their ego. Champions that are heavily reliant on outplaying their opponent don't tend to do very well, simple champions like Tryndamere or Jax who can split-push forever are far easier and provide much more utility in the lower brackets.
Your builds look fine and are tailored around staying alive - this is awesome keep doing this! Most players at your MMR will go "FULL DAMAGE 1000+ AP ONE-SHOT NIGHTBLUE3 CLICKBAIT" and try to do what a Challenger-level player does - and inevitably end up falling short of their goals. Building even one defensive item will save them from TONS of damage as well as be able to be useful for more than that 1 magical 1v9 outplay.
Hope this helps, best of luck to you! It's definitely difficult to climb, but remember that you can't guarantee the enemy team will have even 1 good/smart player, whereas if you, yourself pick up that role, you're guaranteed that 20% chance that they won't have. You'll definitely climb as your macro and micro-management skills improve, make sure not to flame your team and try to play around winning lanes - even if you're the only one winning. Watch your replays to learn what you could do better in every situation. You'll often find things that you never saw in game since we're all usually laser-focused on our champion and can't see the big picture of what's going on.