As long as you have a full-time job, you can afford to work only with people you enjoy working with, set your rates flexibly, and hold sessions just for the joy of it. As soon as your income depends on it, a lot changes: marketing, client acquisition, administrative work, financial pressure and emotional strain.
It can become difficult to set clear boundareis and truly unplug after work.
Another point: As your experience grows, so does your responsibility. People come to rely more and more on your advice. Especially when issues go beyond career matters and touch on personal or mental health aspects, it’s important to know your own limits. And, if necessary, refer clients to other professionals.