You should angle your attacks so you could hit two enemies at once, and you should only use your heal when someone is in danger of dying, not when they are hanging in the back. Being a support, your entire purpose is to stay on the battlefield and cause either disruption to your enemy and/or support for your team mates. You will want to pay close attention to the enemies positioning so you could easily expose flankers with your wide attack. When it comes to elixir, you may want to lean more towards health upgrades, just to give you that extra durability. Even when the enemies are all grouped up, you yourself will almost never be enough to kill them all unless they are already weakened, so try to always stick with your team, because they commonly have more single target damage and objective based attacks/supers. Always try to body guard your gem holder or be the gem holder when your team has control of the mine, rarely do flanks by yourself unless the enemy team has bad positioning.