Hi Jakub Chudiak,
Thanks for reaching out to Microsoft Q&A.
To upgrade your Azure subscription from a free account to a Standard support plan, follow these steps:
Sign in to the Azure portal: Visit the Azure portal and log in with your credentials.
Access your subscription: In the left-hand menu, select Subscriptions. Choose the subscription associated with your free account.
Upgrade your subscription: In the subscription overview, look for an Upgrade option in the command bar or an upgrade banner at the top of the page. If you don't see these options, it's possible that your subscription is already upgraded or the upgrade path differs.
Add a support plan: After upgrading to a Pay-As-You-Go subscription, you can add a Standard support plan. In the Azure portal, navigate to Help + support > Support plans. Here, you can select and purchase the Standard support plan.
If you don't see the upgrade option or prefer not to switch to a Pay-As-You-Go subscription, consider contacting Azure support for assistance. They can provide guidance tailored to your specific situation.
For more details on Azure support plans, visit the Azure Support Plans page.
Please feel free to click the 'Upvote' (Thumbs-up) button and 'Accept as Answer'. This helps the community by allowing others with similar queries to easily find the solution.