Hello Klasnalol,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well.
There is no free 50GB Outlook.com storage, you get 50GB Outlook.com storage with a Microsoft 365 subscription. Also, there is no 5GB Outlook.com storage, you also get 15 GB of free Outlook.com email storage which is separate from your 5GB Microsoft cloud storage (OneDrive).
I suggest you check your storage space via Outlook Web:
"1. Go to Outlook.com and log in if prompted, at the top of the page select Settings gear icon. > Show all Outlook settings.
2. Select Storage > General".
Share a screenshot of your metrics.
Source: https://support.microsoft.com/office/f170fe90-b859-4034-bcda-e186fc6a26f5
Please let me know if you need more assistance.
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Warm Regards