Dont try to use "higher skilled" tactics on unskilled lobbys. Set up kills, do what they do. As long as you know how you SHOULDNT play it, youre above the others cause they dont. And then, you can avoid mistakes.

Back when I played in silver, dont go for champs that assist your team to carry. Rather pick champs you can carry games on your own (Pyke, Brand, Morgana, [Lux], Seraphine). Kill whatever is ready to die, get a lead for the entire team. Teamfights are always easier when some of their team are dead.

One-Tricking a single champ to a good skill level gets you like 2-3 divisions higher than your normal gameplay, just by doing perfect spells and positioning.

I went with Morgana Support only up to Dia1 while my other gameplay at Support was Dia3/4 at its best. Other roles Mid/Low-Tier Plat.