Play just a few simple and easy champions and play nothing else.
Expect your win rate to drop as you climb, for obvious reasons. If you can maintain 55% and above, you can keep climbing without falling asleep at the slow rate of climb.
If you climb high enough, you'll notice players are better but you'll be surprised they still make really dumb plays. Realize that being higher up doesn't mean people won't look retarded at times. It just means they're more consistent, and while in certain cases, they start doing things players below weren't doing, in most cases they're just more consistent.
You might get stuck, in fact, it's very likely, but recognize that to get unstuck doesn't mean to grind a ton of games, it means to improve yourself so you can get back to climbing. Keep an eye out for ways you can improve yourself.
Oh and don't blame your teams. If you're blaming them, then you probably have 0 control over them in the first place, so might as well just focus on the variable you have control over: yourself.