Go with different heroes and always take advantage of the heroes passive.
Gloo'
Passive: Enemies gain a stack of sticky each time they’ve hit by Gloo’s skills, decreasing their Movement Speed. Stacks up to 5. Each stack of Sticky on an enemy reduces their damage dealt to Gloo.
First Skill: Gloo reaches out and slams the ground, dealing damage and leaving a Goo explode immediately by touching it.
Second Skill: Gloo stretches forth to deal damage and immobilize enemies in its path. If this skill hits a Gloo, the Gloo charges over to it, dragging enemies in its path forward.
Ultimate: Gloo splits apart, during which time all Gloo may move together freely at an increased speed, recovering HP and damaging targets they impact. Grab; Gloo attaches itself to a target hero with full Sticky stacks and instantly regains a large amount of its own HP, during which it can freely cast skills with cooldown times halved and Basic Attack to cause an explosion at its current location. For each instance of damage it receives, it transmits onto its host and regains of its own HP. Go;GO Gloo can choose to leave the host before the effect duration is over