If you received a 1099 for part of the year because you were working as a contractor and not an employee at that time, then you should have reported the 1099 income on Schedule C Business Income and Expenses.
If you reported the 1099 income without using Schedule C, then you should amend your return to make that change. Working as a contractor implies that you do have your own business providing your services for those who are paying you.
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