Assign permission to access on item level

Our team uses 1Password, and as we've grown, managing password access has become a significant challenge.

Currently, to give specific people access to an item, we have to create a new vault. Since an item can only be in one vault, we end of creating many vaults to manage permissions. This means that every time we need to grant access to an item, we have to update multiple vaults and user permissions, which is time-consuming and error-prone.

This has made our permission management very complex. Is there a more efficient way to grant item-level permissions or a better workflow to manage access for a growing team without creating a new vault for every single use case?

edit: we are currently on the team plan