Marketing, design and consulting agencies of 10 to 50 people usually run Google Workspace or Microsoft 365, a project tool, HubSpot or another CRM, and a time-tracking system. AI is already in daily use here; the issue is paying for it sensibly. Give business seats to the people who write and analyse every day, and move everyone off personal accounts holding client material. Automate the handoffs between CRM, project tool and invoicing with Zapier or Make. Use AI for first drafts and research summaries, never final client deliverables without review. Ignore tools that duplicate what your existing assistant already does.