You can follow the steps in this official article if you'd like to upgrade your Trello workspace: Change or cancel your Trello plan 📚
This is basically what the article says:
To change your Workspace’s plan:
Select the Trello logo in the header
Select the Workspace
Select Billing
Select Explore plans to see the current upgrade and downgrade options for your Workspace
Choose the plan you prefer
When you change from Premium to Standard your Workspace will change to the new plan at the end of its billing period.
When you change from Standard to Premium, your Workspace will be upgraded, and you will be charged a pro-rated amount immediately.
If you start a Premium trial on a Standard Workspace, your Workspace will automatically upgrade to a Premium Workspace at the end of the trial. You can cancel the upgrade from your Workspace’s billing page.
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