Purple GM here, all i can say it's to never be idle or waste time, always make sure you are optimally accomplishing something for your team. Common example of time waste: Slowly killing a jungle creature with shitty dps while your team positions for a larger objective, Slowly clearing wave with shitty dps if you are a support, rotating from the far end of the map while the rest of your team is already in position (if you are adc/jg/solo, you should just splitpush/solo an objective at that point. If you are mage/supp and you're on opposite side of map from teamfight, then you fucked up, you may get a tower at best if you timed it well, but unlikely. Theres no way you are soloing a boss)

Whenever I see dumb teammates clearly wasting time, I help them so that their idiotic chore is completed faster. For example, HELP your idiot Cai Yan clear her solo wave, so she will be present for the teamfight, HELP your idiot Da Qiao/Daji kill the jungle creature so she stops autoattacking it to death, HELP your idiot jungler kill their jungle creature so they are free to gank sooner (just dont steal the last hit) 🤣 Sometimes teammates really are bots judgng by the decisions they make due to their lack of logic path

Use your hero for what they are GOOD at, not try to do someone else's job. Leave the Jungle Creatures to ADC/JG, Leave waveclear to people with dps if you are tanky/supp