Can I start two Amazon Brand’s without a trademark?

Right now, I am selling under “Generic”, which seems to be a big mistake. I have an LLC and am hoping to sell future products under my LLC’s name on Amazon. I also have my store info display name similar to my LLC name. It seems like I don’t have to have a trademark to sell under a branded name if I can show Amazon that my packaging has my LLC name on the packaging?

Now to complicate things, I also want to test another niche on Amazon and sell under another brand name (so 2 different brands). This other brand will be under the same LLC, but ideally with another brand name on Amazon. How should I go about this and can it be done under the same LLC and Amazon account? Thanks!