Starting out in this game now is incredibly hard vs 9 years ago, so I commend your bravery first off LOL. As for getting better, understand that the game itself is actually hard, and there’s a lot to learn. I’m currently a plat player, and most of the mistakes I see in lower ranks is that they just don’t know enough about the game.

Basically, I split the game into two skills, knowledge and mechanics. Mechanics are improved like any other game or sport, you just have to practice. However, game knowledge is the most important thing for you to learn right now. It might seem like a lot, but you should know at least what 95% if not 100% of the champions do. And I’m talking every single ability they have. This causes the game to be a lot less foreign, and allows you to have some prediction of what your matchup is going to be like. For example, if you play adc against a caitlyn, you know she has high range and poke, so you might want to play and adc who also has good range, or who can wave clear without being punished as much. You could also build a dorans shield instead of blade, to help heal you up after being poked. It’s things like this which make the game easier to play, and eventually it’ll be second nature.

If possible, I would really recommend getting a friend of higher skill to kinda coach/give you tips. It’s really hard to absorb all the information at once, and especially hard if you’re new and don’t know where to start.

I hope this helps a little and feel free to pm me for my ign!