Reasons why adding things in the above comments would do absolutely wonders for the franchise with unquestionable certainty.
1. Adding more S+ speedlist and opening up other Playlist to all classes will keep racers always wanting to race based on the sheer amount of tracks to choose from. It eliminates the repetitive feeling. NFS heat and nfs 2015 had an incredible amount of races to choose from for example.
2. Making other cars compete with the regera will bring back racers who want to race at a high level, but in a different vehicle than the regera. When driven properly, it's game over in that car. There is truly no match for it when it's raced with at the level myself and my racing crew race at.
3. Adding a full night time mode with heavy cop pursuits brings back that gritty illegal street racing feel. Nighttime mode is only in free roam currently but not in the speedlist. The game looks way cleaner at night and it feels way more like nfs at night with cops and helicopters.
4. Adding more cars or enhancing the performance of cars will bring back tons of players who want to drive their favorite car!
5. Adding leaderboards makes people competitive and want to become one of the top racers online. Leaderboards add fun, competition, and longevity to any racing game!
6. Increase the party size to 8.