I peaked Diamond 1 99lp a few weeks ago (though I dropped a bit and I'm currently D3). To answer your question: You will not improve much at all if you keep playing a lot of games without thinking. And you will not improve much at all if you never read up resources online on how the game works.
Trust me, I was stuck in Gold and Plat for the past 3 seasons, if you're not tryharding improvement, you will not get anywhere. It's impossible. If you're playing for fun, that's fine, but if you want to actually get good, you need to start reading up online and taking notes on how the game objectively works and what the best plays are. You need to understand the "theory" behind how a League game works. Then, you need to start VOD reviewing every one of your games, listing all of the differences between you and the theoretical perfect performance, and consciously trying to fix bad habits as you play. Playing a lot of games might improve your mechanics, but it won't fix anything else. It's a waste of time.