Seeking Advice on Gaining Business and Sales Knowledge for GTM Career Pivot

Hi all, I worked as an Integration Software Developer for the last 6 years building complex enterprise-level integrations between various systems/tools in the education and banking sector. Right now I am trying to pivot to GTM and fairly comfortable technically in building n8n automations. However, I have noticed that I lack the business/sales knowledge. What is the best way to learn this? Would any agencies be happy to hire me as a unpaid intern? If yes, please DM