Finally got to Icon 675 today, which means I now have all the Icon Perks fully upgraded and can throw all future Perks into Bucks (pity its 3 levels for 1 perk now though).
Have realised the Stories are fun but don't get you any credits or followers, so I've parked those until I have a more complete car collection.
Still have the "regular" Street races events and the 30 min hypercar event to do. Have been leaving the post release events to do once I finish those.
Also, after 6 months with no voices even in cutscenes, last week I loaded up the game and was asked to set my brightness setting and suddenly I have voices everywhere Must be a "bug" that sorted itself out.