What's the best way to reach out to procurement professionals for user testing?

Hi! I work at Scoutbee, an AI Tool to help procurement find more and better suppliers, we are currently improving this tool and developing a new one and at this stage it is great to get user’s feedback in order to make sure that we truly meet your needs and change/add whatever is necessary before production, therefore we need Procurement professionals insights through testing of the product and some interviews. Is there any channel or even through here, a suggestion to better reach out to you ?