Hi @var vlad ,
Welcome to the community!
As far as my information if the business class plan expires you won't be able to access any features of business class but Trello supports unlimited personal boards in free plan https://trello.com/pricing change those boards to personal so that even after the business plan expires you can still access them. But you won't be able to use more than 1 rule in butler, cant use more than 1 power-up in a board many more things you won't be able to access in the free plan.
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