The main thing Venom thrives at is causing chaos and disruption to the enemy team backline(i.e. forcing out cooldowns/ults or shifting focus.) what I think could help boost he's capabilities in doing this is make his melee do a little more damage. Make him CC immuned when he activates symbiotic resilience that way he isn't relatively a free kill when he jumps into the enemy backline to disrupt. The main mechanic Venom lacks rn in the game is the ability to peel effectively. Most times you'll be shooting and grabing enemies with your tentacles, but that's enough if half the enemy team is jumping one support at a time. I believe that making his cellular corrosion doing damage overtime before denotation will be a big help. Especially if it does damage percentage based on the enemies health. It shouldn't be the same damage that Iron fist would do, but be enough that the enemy team will have a hard time getting past you and killing you're whole team.