Usually you should tell the insurer when information you gave for the policy changes, including occupation where the policy asks for it.
Occupation is part of underwriting
Insurers can price occupations differently because their claims experience differs. A new job can therefore change the premium.
Describe the real job
Use an accurate description that matches what you actually do. Choosing a vaguely similar job title simply because it prices lower can create problems.
Commuting can change too
A job change may alter mileage, work location or whether you drive to multiple workplaces. Those changes can matter separately from the job title.
If work has changed substantially, it can be worth comparing the market at renewal rather than assuming your current insurer will remain competitive.
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