Describe the commitment honestly
What will the design partner do — weekly calls, real data, a live deployment? What do they get — early access, pricing, influence on the roadmap? Write it down as you would want it written if you were on the other side.
Name the profile precisely
"Ops teams with document-heavy support flows, 50–500 staff, already using a helpdesk" attracts the companies whose feedback will generalise. "Anyone interested in AI" attracts nobody useful. Put the profile in your B2B ID's "best for" and set "looking for" to design partners.
Let the right companies come to you
Businesses on B2B.ID that match your profile can see that you are looking for design partners and send a Request Partnership. Because the request carries their B2B ID, you can evaluate fit before the first call.
Keep the group small and the loop tight
Three to five committed design partners beat thirty passive ones. Close the loop on every piece of feedback — it is the only thing that keeps a design partner engaged past week four.