What elo do I have to wait to meet people that know how to end games?

Hey I'm a D5 kata main. I always had this problem that people don't know how to close games. It's a big problem especially with kata because when you get fed you destroy everyone, but if your team is bad and dont know how to end, enemy starts buying MR and you can't 1v5 anymore, leading to a loss while it should be a win. So, when do people start to have a clue about that? I really hoped it would get better in diamond but obviously not.
Report as:
Offensive Spam Harassment Incorrect Board