How to carry?

Call shots to your team. Make plays. Support your team. You need your team to win, so boost their confidence instead of trash talking. Trash talk the enemy

You are only 10% of a game... No exactly way to carry if 90% remained do not agree...

At least, try to AP mid and roam often, make your teammates have better chance to snowball in all lane. Or play hyper carriers with a LCS-level.

Check this list that defines a good player (according to my opinion of course):

1. Always ping for important locations and events. Even other lanes missing enemies etc.
2. Never abuse pings to stress or harass your teammates. I have died many times because somebody pinged all around me and I got confused
3. If you're laning, watch where your jungler is and if he decides to gank, be ready.
4. Watch other lanes so that you can fullfill point 1.
5. If you're successful on mid, roam to top and bot and help your teammates get kills.
6. Don't harass your less skilled teammates. If they occupy gold-demanding roles (ADC, AP carry), try to help them get gold
7. Use chat. Talk to people and listen to people.
8. Taunt the enemy if you think it will improve your team morale. I often taunt the guys who post "report my team" to global chat.
9. As jungler, you can have real control over the game. You're mobile and you know everything - laning champions are just big minions. So if you're good at this role, try to prefer it.
10. If you fail do not blame others. You'll just look stupid.
11. Never risk too much to get kills unless these kills would ensure important achievement (dragon/baron/tower)

I could add more, but I must go.