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Good morning @Gabriel Vanegas Kobets welcome to the Atlassian community.
You are mid way with the steps. Additionally, you need to step into the admin section >> billing>> change the plan to make it complete.
This article is for Jira software but applies for Confluence as well.
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I believe it should be automatic once the current month's Standard billing cycle expires. You can also check under settings - billing - manage subscriptions
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