The message is clear — you’re approaching the limits of the free quota, likely because you are working in the bigquery sandbox without a billing account configured.
Thus, you are subject to the free tier limits, in particular, 10 GB of active storage and 1TB of processing for queries.
Google has a guide for upgrading from the sandbox but the key will be to enable billing for your account so that you can access more storage.
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solved What does the Bigquery error “Your project exceeded quota for free storage for projects” mean?