stuck in bronze cuz im bad

The first thing I do with a new game is play all the different stuff I can. Then I learn not only who I like to play the most, but also the way that I like to play the most. I'm playing all the champs in each role/lane in alphabetical order right now (in blind pick) and my mmr has dropped like a rock, lol. But that's OK because I'm finding out that I like people I didn't think I'd like (ahri) and disliking people I thought I'd like (thresh). You'll find that some champs will just "make sense" to you, and those are the champs you should start spamming.

There's a secondary benefit to playing through everyone in the game too, and that is that you understand what they do, so you know how to not only counter them better, but also work with them better when your teammates play them. Truly understanding what each champion is capable of is probably enough to pull you into silver.

As you're going through this, work on fundamentals - cs and map awareness. Once you know who you like to play, take the time to learn to cs with them CSing with poppy is very different than csing with Varus for example.

Map awareness though, that is the same no matter who you are. So you can work on that the entire time you're playing. When you're about to engage, look at the map. When you disengage, look at the map. When your spells are on cooldown, look at the map. When you're walking back to lane, look at the map. Every time you don't actually need to be looking directly in front of you, look at the map.

If you do the above, you're probably going to hit gold.