How to get your teammates to push?

Many games that I've lost were due to not pushing and losing sight of objectives. I've tried so many different approaches to ask my team not to all chase 1 kill into the enemies jungle. But every game it never fails. I'm at bronze 2 currently, was silver 3 last year. I had bad luck of having 6 afk in my first 10 games (not an exaggeration,) and now I have not been able to get out due to poor attitude and people just giving up when things aren't going well. I'm not bad but I'm not good enough to carry myself that high. I want a constructive way to tell my team mates that when you're ahead, you need to go for towers and objectives, not roam their jungle looking for the next kill, or back at the worst times, or just roam around waiting for them to respawn again. I main support, and I'm not looking to change my role. I just would like some tips as how to get your teammates to listen. I've tried tough love, kindness, it just doesn't seem like it clicks into anyone's heads that at such a low elo, it's as simple as that. Or maybe the problem IS just me. Either way, I'd love some advice!