Hi @Marketing Elinox ,
Welcome to the community!
You can transfer a board from one account to another by adding your work account as an admin for your personal boards. Then, you can leave those boards from your personal account.
How to add an admin: http://help.trello.com/article/790-making-a-user-an-admin-of-a-board
How to leave a board: http://help.trello.com/article/804-leaving-a-board-in-trello
also, check out:
Calling all Trello + Confluence users! We're celebrating all things Work and Wellness in our Confluence collection, where our team has been sharing activities to create more mindfulness around the ...