You may want to close the account and pull excess funds out:

Keep receipts of any qualified or non-qualified distributions. While non-qualified distributions are not recommended overall, they should not be viewed as prohibitive. Due to taxes and penalties only on the earnings, only near 5% of any distribution amount is lost. (See also the math in Jane’s example under the “No RMDs or NIIT” heading)

Tax Form 1099-Q is generated end of year

If the funds will be used by the beneficiary for any large non-educational purpose (Example: A home down payment), consider first changing them to become the account owner. A younger beneficiary is likely in a lower income & tax bracket and will likely pay less tax on the distribution.