You can ask the company to send a corrected w2 with no wages and issue a 1099-NEC instead. That would be the easiest solution. I am assuming you entered the w2 as wages but I wonder if you also claimed them as income for the business. You can't claim the same income twice. Talk to your former employer, develop a plan with them. You may need to amend the return you filed but not until after more thought, discussion and original return is settled with finances finished.
Be sure they know moving forward, you are a contractor. If they are your only client moving forward, it sounds like a part-time job.
Worst case scenario:
If your income was from one company and they are determined you have a w2, you will have to really prove you were on your way as a contractor and the w2 was a mistake. You can use Publication 5520 to help prove your stance as a contractor. When you have more clients in 2023, that will strengthen your position with the IRS. Most audits of this type will take a while to be started so you have time to build your business and clientele.
See Small Business and Self-Employed Tax Center |IRS.
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