At what point do you change course?

I started taking Vel'Koz support recently to climb my way out of the B5. It was working pretty well last week. Won 4 out of 5 games. Last night, for some reason, I lost three in a row. In each, it just felt like a comedy of errors. And after the first, the team never recovered. For example, the Zed would roam bot, get set up perfectly for the kill by the ADC and I, and he just wouldn't get the kill with a "I don't know what happened there?" comment.

I was talking to a friend of mine who plays recently (before last night) and he was like "You know, if you take support, you have to realize that you can't complain because you didn't take a carry-champ." Right now I sort of feel like I should give up on the role (support) because while I have fun playing this game, it's not fun to play with people who don't try to improve. And that's what a lot of the B5 is. Players who believe those that got to the top are just lucky. Meanwhile, I'm asking people left and right for advice, reading guides, and checking Champion.gg for item builds, top champs in lanes, and everything else.

And not to get too deep here, but it's starting to become a larger issue. I love the game. I like playing, but then I come to play, get trapped with folks who evidently, and honestly I mean it's evident, aren't trying to improve. I end up wasting 3 hours, then I'm pissed I didn't do something more productive nor did I achieve anything in game. About a month back I uninstalled the game because I thought it was setting me back in life.

So, once again, I'm looking for advice. Do I go top lane with Cheese Champs and carry? Or do I stick it out and ignore the one bad night. I think my major concern is that I'm about to go back to the B5.