Where to find beta test users for small B2B SaaS ecommerce inventory management app?

Hi all,

I'm new to IH but have been working on software for a while. I've been developing an inventory and supply chain management tool for small e-commerce sellers (<$500k in sales), and have had trouble finding user to beta test with.

If you goto user seller groups like FB or Reddit they kick you off as too self promotional. Any ideas or suggestions would be greatly appreciated.

If you would like to check it out you can find it here: https://gazel.app/