What I have seen here on the Forum that TN GTV case workers don’t accept freelancing work evidences for the visa endorsement. You need to work at a tech product led company under contractual obligation from the company and show related evidences for the endorsement purposes.
I would suggest you to go through the TN’s guidelines and what evidences you need to provide for different criteria. Once you identify the type of evidences you might want to show for your endorsement application then you can start planning what you need to do in your career to be able to show them.
You can also read other success stories here as well to see what type of evidences others have provided. In case it helps I have also written what evidences I have shown here: This is how I got my Endorsement for Global Talent Visa under Exceptional Talent Route (AI/ML Researcher)