Can I trace my drawings with a different app - vectorizer

Besides what has been said by Nancy: if the source file is not generative AI, you do not need to tick the generative AI flag during submission. Just vectorizing an asset does not make it generative AI, even if they claim using AI for verctorizing the assets. 

Your assets still need to follow the quality requirements of Adobe stock. Using any program to vectorize your assets, including the Adobe options, do not guarantee that the asset is in the quality as required.

If you use AI to vectorize a bitmap, you're substantially changing the image properties from its original state to a generative AI vector graphic.

Automated tools tend to create too many path points. I'm not sure the final output will be suitable for Stock. Although tedious, hand tracing gives you complete control over the size & number of path points in your vector graphic.  And you control all other parameters as well.  Whichever method you use, it must conform to Stock's Vector Requirements below. 

https://helpx.adobe.com/stock/contributor/help/vector-requirements.html

Is it worth having AI do this for you?  I don't know.  You'll have to run a few tests first. 

Is it worth it to you to go from original artwork to generative AI?  Again, that's a choice you have to make. 

Good luck.

You can, and yes. Submit as AI.