HR, Workspace Expert - Answered on Aug 25, 2023
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The best advice is ‘Ignore Them’.
It is human tendency to be jealous and that's what your colleagues are feeling.
Since they can't compete with you on skills, they are using these unethical means to distract you.
Remain focused on your job and don't let your good performance slip.
Keep your manager in the loop about the office politics so that s/he can back you if things get worse.
You can take 2 immediate steps.
First, get your KPI and goals clearly defined in writing so that you have clarity as to what you need to do.
Secondly, since you have been in the job for 15 years, you will have good connections in the organisation. Speak to your seniors keeping your manager in the loop.
I am sure a solution will come out and your manager will need your expertise for the team's success.