If you reported your transactions correctly there is no need to file an amended return.
If you are saying you did not enter wash sales, then you can start the amended return process and see whether the wash sale entries give you an additional refund or tax due.
Regardless, it is a good practice to amend and enter your wash sales if you still own the same or substantially the same securities. Entering the wash sales now will document that your cost basis was adjusted for those sales so you can claim the correct cost basis in later years.
See How to Correct Federal Tax Returns and How do I amend my federal tax return for this year?
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