Your bike is not overweight, so you will be paying a lot of money to lighten up. and weight is only critical on climbs.
For any components, work out the $/gramme saved. Start on the tyres and tubes.
The biggest advantage of a carbon fork compared to your Al one
will be comfort. You may not save much weight with a cheaper carbon fork.
A set of aero-profile wheels will help you to race faster, if you do time-trialling/solo riding, but in a pack they are of little advantage. Your current wheels are fine for general riding and training.