I know it is bad to say this

The team is always a problem. It has been that way in silver, in gold, it is this way in plat, and it will be this way in diamond and beyond. I finally got to diamond a few months ago. I've grown a large hate for the typical D4/D3 jungler.

But if I lose more than I win on the long term, then it's my fault. It means I have to learn something new, improve on what I'm already doing and/or quit a habit I didn't know it was bad.

Watch some challenger videos on youtube. Don't skip ahead. Watch the whole lane phase for starters. We always have something to learn from them.