How do pre-sales technical support engineers plan their careers?

I suggest you combine your own characteristics and expectations of life, career and marriage to think and make decisions.

Usually this structure:

1, self-awareness; -the state of your habits and likes;

2. Post-cognition; -Collection and analysis of professional and post information of this major (or interested major);

3. Work plan;

4. Inspection and supervision of effective work.

Refer to the book "Meeting the Unknown Self" and "What color is your parachute".

If economic conditions permit, try to find a professional consulting agency nearby and complete the system planning under the guidance of professional consultants.