First roadbike upgrades
The best upgrade is the one that solves a specific problem or replaces a worn out part.
Changing out any part on your bike should be done with a goal in mind. Your goals should be determined by identifying some specific way your bike could work better for you based on your riding style, terrain and personal goals. A "good" upgrade for one person could be a terrible modification for you.

Based on this premise you need to evaluate what specifically disappoints you about your bike? Here are some examples:


My riding position is not comfortable
I don't seem to have the correct gearing to meet my needs
My bike has a very rough ride.
My brakes are not performing to my expectations
There are many possibilities.


Once you identify the need, or the goal you can ask a specific question and gain specific answers. The other benefit is that you can know if the change you made met your goal.