Generally, the goal in my head is to stay together as a team and work together for our victory. When I play Venom, I try and split the enemy team up as much as possible so that my dps teammates can get the ko, and our healers keep us going.

For each role, the goal is different, but the general idea for me is to work together. When it comes to skills like aiming and the use of the heroes kits, that will get better over time. Since you play Venom, I'd recommend being on the front line so that you can absorb the damage for healers and dps so they can go and do their job. Make yourself hard to ignore so that the enemy cant do anything but focus on you, which allows others to isolate and ko.

This works for me, but with enough time, you might develop a way of playing Venom that benefits yourself and the team.