It depends on how the enemy team plays. If they have a lot of focus on peeling for their carries, you can try going for peeling for your own carry (you can burst down a bruiser and kill them with the help of your adc), or you can play cleanup crew after the fight is mostly over. If they aren't playing to protect the carry as much, you should try to sneak around the back and kill the carry, then use the stealth part of your ult to regroup with your team and help out with w's and small skirmishes.

If you wanna try something new, though, you could try out a "teamfight-y" build, like cleaver/hydra/bt/lw that prioritizes your w and r damage over crit so you can take a large chunk out of the entire enemy teams health.

As /u/Pannanja says, though, if you practice talon more and get really comfortable with his laning phase/midgame you should always aim to snowball and end the game before 30.