When you downgrade a sponsorship, the change will become effective on your next billing date. There are no refunds for payments for GitHub Sponsors.
Downgrading a sponsorship
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On GitHub, navigate to the sponsored account's profile. 
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Navigate to your sponsorship dashboard for the account. - 
If you're sponsoring a personal account, under the user's name, click Sponsoring.  
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If you're sponsoring an organization, to the right of the organization's name, click Sponsoring. 
 
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Optionally, to manage a sponsorship on behalf of an organization, on the right side of the page, use the Sponsoring as dropdown menu, then click the organization. 
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On the right side of the page, beside "Select a tier", review the sponsorship tiers available. If more than one type of tier is available, "Monthly" tiers are shown by default. Click One-time to show the tiers for one-time payments. 
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To the right of the tier you want, click Select. Alternatively, if you want to select a custom amount, enter the sponsorship amount in the text field provided, then click Select. 
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Click Update sponsorship. 
For information about canceling a sponsorship, see Canceling a sponsorship.