As gragas, You will want to ensure that you help your Jungler every chance you get. This is especially applicable when your Jungler is trying to take the Rift Herald or is invading the enemy jungle.

In a team fight, always try to separate an enemy from their team. Bonus points if the target is immobile and has no form of escape, as it would be a guaranteed kill.

Roam around a lot when possible and try to help your mid-laner out. If you can get them a lead, it will be sure that they will come to help you out sooner or later as well.         As gragas, You will want to make sure that you help your Jungler every chance you get. This is particularly applicable when your Jungler tries to take the Rift Herald or invades the enemy jungle. In a team fight, always try to separate an enemy from their team. Bonus points if the target is still and has no form of escape, as it would be a guaranteed murder. Drive around a lot when possible and try to help your mid-lane out. If you can get an advance, it will be sure that they will come help you sooner or later too.