Hi Dandan Cao,
Thanks for reaching out to Microsoft Q&A.
Azure does allow students to renew the free account for another 12 months if they still meet the eligibility criteria. Ensure that you are still enrolled at an accredited educational institution, microsoft may ask for proof of enrollment. If yes, go to the Azure for Students page and follow the steps to apply again using your student email. If you're eligible, Microsoft will provide you with additional free credits.
If you have exhausted all credits and cannot reactivate your student account, you could consider transitioning to the Azure Free Account, which provides free tiers of various services (but without the $100 credit). Note that a payment method may be required, but Microsoft won’t charge unless you exceed the free limits
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