How to promote products on multiple accounts?

Hello everyone. I'm running ~90 Pinterest business accounts. I uploaded some t shirt design on Teespring and create some mockups.

How should I promote my t shirt on all my accounts effectively not get ban/ block?

I have some ideas but I'm not know what work best:
1- pin all mockups of entire store to 1 main account then other accounts repin
2- pin mockups randomly across all accounts then repin randomly
3- pin 1 product to 1 account then repins (1 account promote 1 single product of my store)

All accounts are random pin funny pics, repin inmy niche (dog) daily. I am not have my own domain on my store (the link is teespring.com/mystore/..)

I really appreciate all your help

Method 3, 1 acc / 1product, where each account does not share the same link and image would likely net you highest potential traffic. The second best option is 2, mixing and matching all product links and images with all accounts, potentially less traffic than 3 but there are less setup involved. The worst is method 1.

Pinning from web 2.0, main domain is generally safer from ban than your own domain, so you don't need to worry much about it.

Tell me how to make 90 accounts I tell you how to keep them safe. I run 15 accounts, from about 1.5 years and traffic is still good.