I'm sharing RedBubble's response about having multiple RedBubble accounts and my opinion on niche shops vs random niche shops with collections.

**** RESOURCES TO HELP YOU EARN ****

Struggling with getting organic sales with print on demand and want more sales WITHOUT paying for advertising? Take my POD Niche Shop Success Course...
https://learn.passiveshirtprofits.com...
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New to Print on Demand? Watch This Beginner's Video...
   • Print on Demand: How to Do Keyword Re...  

TOOLS I USE FOR MY POD BIZ

PlaceIt.net (For Social Media T-Shirt Mockups & Videos)
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Merch Wizard
Keeps your Merch By Amazon listings organized and, save uploading time and automatically download / view sales reports.
https://gumroad.com/a/277984371 (affiliate link)

My Favorite, Free Color Selection Tool
https://color.adobe.com/create
See how to use it...
   • 3 T-Shirt Design Tips for Beginners o...  

Software I Use...
Adobe Creative Cloud Suite (Photoshop and Illustrator)
https://passiveshirtprofits.com/adobe (affiliate link)

Looking for less expensive software options?
https://www.designer.io/en/
https://www.gimp.org/
https://affinity.serif.com/en-us/