@Silje now for the practical application of the above… Using your current training plan as an example (Women’s Cycling Challenge), a race replaces a workout. So ideally, you would race no more than once a week if you want to continue progressing in your training, taking one week off racing every 3 weeks to honour a recovery week.
Then you would have to pay careful attention to how you are feeling after a few weeks. Are you still able to perform well on the workouts? Are you seeing improvements in your cycling/fitness? If the answer is yes, great, keep going.
I used to race in Zwift often - for a period of time I raced weekly. Then one day I decided to analyze the data files from my Zwift races. What I saw was in line with what my coach at the time told me: my efforts were almost identical, in every race - regardless of the course. The main reason for that is… your body gets used to that type of effort, and you end up producing almost identical power as a result. This is possible because racing in Zwift is not like outdoors. There is very little that matters in Zwift other than producing power constantly. No bike handling, no aerodynamics, no coasting, no gravity, no wind, no other riders… There ARE skills you can use to conserve and be more efficient such as cadence and body position (seated/standing), but that’s about it.