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If the limitations of Excel Online don’t fit your needs, there are options to download the desktop application for free, particularly for students and educators. Many educational institutions offer educational licenses through Office 365 Education, which you can access by signing in with your school email.
Another avenue for tech enthusiasts is the Microsoft 365 E5 Developer Subscription available to Visual Studio Professional or Enterprise subscribers. Although primarily aimed at developers, it provides full functionality suitable for work-related tasks, as long as you are using it actively.