Yes, you can increase or make additional payments on your Credit Builder Loan to pay it off sooner.
However, keep in mind that the benefit of a Credit Builder Loan is that we are continuously reporting positive payment history of your on-time payments to the credit bureaus (Equifax and TransUnion). By paying off your Credit Builder Loan early, you will shorten the duration we are reporting payments for your loan since we only report to the bureau once a month. You may see less of an impact on your credit score with the shortened reporting duration.
If your goal is to pay less overall interest, then the additional payments can help you pay off the loan quicker.
To make an additional payment, please see How do I make a one-time loan payment on my Credit Builder Loan?