Hi — I get it, Entra Domain Services can burn through student credits fast.
In general Microsoft won’t “top up” credits on a student/subscription just because they were consumed by a resource. The usual options are:
Delete the EDS instance (and any linked resources) so you stop the spend, then wait for the next credit cycle (if your offer renews) or keep using the free tiers.
If you want to keep learning without extra cost, switch labs to cheaper services (VM + AD lab, or use trial/free alternatives).
If the subscription is actually suspended, you can still open a ticket from the Azure portal under Help + support (or ask the subscription owner/admin to do it) and ask if anything can be re-enabled after cleanup — but extra credits are unlikely.
If you share which offer you’re on (Azure for Students vs Visual Studio subscription vs GitHub student credits) and whether the subscription is “Disabled” or “Suspended”, I can point you to the right support path and what to clean up first.