Objective Priorities
In general, inhibs and towers are THE most important objective. They grant you money and most of all grant you pressure and map control. That means during a siege, you HIT THE TOWER if you are ADC and the enemy team is zoned, not dive, not use Lucian ult, HIT THE TOWER. This concept should be grasped by every ADC in every elo: your role is not to be the super flashy assassin who racks up kills, you are supposed to get big and be peeled for so you can survive, do objectives and help take down frontliners.
If you are not hitting objectives and not surviving, you are functionally useless to the team.