Don't be afraid to help each other do their jobs!
Not everyone is stuck doing one thing, and while it may be obvious at times a little pep-talk never hurt!
Help the support ward objectives, not just your own lane. A pink ward in the tribush goes a long way to make the support happy, Mr/Mrs ADC Main! DPS is your name, but objectives are the game!
As a support, don't be afraid to roam! Your team, not just the ADC, needs you! Be the foundation of your team's success, not the shadow of the carry!
A laner doesn't always need Rift Herald, jungle mains! Wait, stop throwing tomatoes at me and hear me out! Sometimes your laner does not want to push their lane. Don't be afraid to ask! Denying the enemy team Herald for a few minutes, getting your team some sick global gold, and dat buff that can really help you push out that bottom lane that doesn't have time to get Herald but would love the power of it, is totally worth the jungler getting it! Also, for taking towers, don't forget your krug smite buff! Towers never see it coming, so true sight eat your heart out!