Speak with your employer and file new withholding forms for New York and New Jersey.
For NY, file Form IT-2104, and for NJ file Form NJ-W4.
It appears your new employer either started NY withholding at the end of the year or stopped NY withholding and switched to NJ shortly after you onboarded.
Are you actually working in NY full-time? Or are you remote? You say your salary is 100% from a NY employer, but another reason you may not have much NY withholding is that your employer classified you as a NJ employee, in which case you may not have to file a NY nonresident return, or you may only have to report NY income for the days you were working in NY.
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