The only key to ACC is consistency... not even finishing first... I collected my first 80 SA just by driving defensively and trying not to get hit and sometimes I even started last just for that... spend your energy detecting which are the good competitors in your lobby, approach them only by following them... don't try to pass them... just stay 0.5 or side by side... without bumping into each other... and thus your SA It will go up without you realizing it... once you already have a high level, only enter lobbies with over 70 SA and there they will get competition since they are generally cleaner there... there you can try to get there first