I don't know if I'm getting seriously unlucky or if this is normal, but I have noticed I get an afk usually about 1 in 3 games. I am Gold 3 At the moment and Whenever I win a game I get an afk the very next game. Any Advice on what to do?

My aim is really bad like that of a silver. I have gotten to plat from silver without improving my aim at all bc i just have decent game sense but now i cant keep with with plats. How can i improve my aim now?