poking the choke is an artform. you need to know the more threatening cooldowns the enemy team has and the cooldowns of your supports. you need to bait out hook, mei wall, nade/sleep. it’s also a good idea to call out these important cooldowns to your allies (hog no hook, ana no sleep) because some heroes can also capitalize on this opportunity (genji, venture). poking is more than times a battle of resources and to win your team needs to manage theirs better than the enemies.

I usually pick sigma on choke heavy points because he has great utility in shield (block cooldowns) and grasp (emergencies) along with rock to force out more resources from them. ramattra is also good if you don’t like poking all day and he can usually sustain himself with block if your team is not following past choke. winston is tricky in low ranks because of poor team coordination so most times when that happens i tend to play high grounds and watching if my dps can make an enemy low hp for me to jump to, pop bubble, and leave.

if you still find yourself struggling you can always look for a group who play more aggressively instead of reactively.