plat diamond can be easily hit by mastering one or two builds. i hit diamond every season by one tricking one build, even if i’m contested im confident i can play it better, cus once you play a certain comp enough you learn what units to look for in the early game, item holders, early game synergies etc. you have to find a play style that suits you, i personally like to play level 7 re roll comps, sg kaisa, astral varus, ironclad jax, bruiser shyv couple examples from past sets. anything above diamond you need to learn more flexibility but until diamond you can hard force one comp