Not sure if anyone discovered this (haven't done a deep dive to see what info is out there)... but if you want to keep testing builds, even after you use em all up, you can delete the builds data and start fresh.
You'll obviously lose your builds, so you may want to take notes / screenshots when you create builds to recreate em later.
On PS4: Application Saved Data Management => saved data in system storage => delete => NBA 2K20 demo => delete "CareerModeBuilds" & relaunch the demo.
You start fresh with zero builds (same MyPlayer face tho). I assume the steps are the same on other consoles.

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