How do you create design for your products?

Hi,

Wanted to start an E-commerce for T-shirts with print but couldn't spend the time to lea advanced design software.
Outsourced the design process instead and quickly found that creating collections was costly. Also time-consuming to send inspiration, feedback etc.

Don't think I'm alone and would therefore like to hear how you've solved that problem and your thoughts on it!
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How do you create design for your products? WordPress ...