What careers are available for someone with a PPL?
If you are talking about Europe (EASA) Doc 1178 states at PPL privileges:

a) The privileges of the holder of a PPL(A) are to act without remuneration as PIC or co-pilot on aeroplanes or TMGs engaged in non-commercial operations.
(b) Notwithstanding the paragraph above, the holder of a PPL(A) with instructor or examiner privileges may receive remuneration for:
(1) the provision of flight instruction for the LAPL(A) or PPL(A);
(2) the conduct of skill tests and proficiency checks for these licences;
(3) the training, testing and checking for the ratings or certificates attached to this licence.

Bottom line you could make money with PPL by being a flight instructor or a flight examiner. A side effect would be also accumulation of flight hours that would permit you to continue with a course for commercial pilot.