You can upgrade and downgrade Git Large File Storage for your personal account.

Purchasing additional storage and bandwidth for a personal account

Purchasing additional data packs increases your monthly bandwidth quota and total storage capacity for your personal account. For more information on Git LFS, see "Versioning large files."

Downgrading storage and bandwidth for a personal account

You can downgrade your personal account's storage and bandwidth for Git LFS by increments of 50 GB/month in bandwidth and storage.