Yes, you should amend the 2023 tax return. If you have a balance due, it's recommended to file and pay as soon as you realize you need to amend in order to stop the penalties and interest from accruing.
Form 1099-NEC is used for non-employee compensation, which is often paid to freelancers or contractors and reported on Schedule C, which is why you are being asked business questions. If you have no related expenses, you can answer the questions and report just the income on Schedule C.
See: What is a 1099-NEC?
