New acount vs. Same account

Hi. So i’ve been selling a product and it’s sold well. I did everything by the book, but I believe its winding down. I am currently working on a new product that has nothing in common with the original and for this one I’ve thought about bringing on partners so i can grow faster.

Would you suggest starting the new product under my current account since everything will assist with the new product, also saving the costs of a new startup.

Or would you suggest I separate the two and open a second AMZ account especially since i’m thinking on bringing on those partners and it will make it easier to keep assets, cash, etc. separate from each other?

And is there a third option? Starting under the original account and then moving it over to a new account? Is this feasible, allowed, and easily done?