Campaign finance laws require any unused portion of campaign contributions to be returned to the donor. (I would have done so even if it weren’t the law.)
If I don’t have a primary opponent or if I win the primary (which makes the general election a foregone conclusion in this strongly Republican district), I will offer to give back the unused portion of your donation. Specifically, I will figure out what percentage of the donations were spent and refund you your donation minus this percentage. I will email you and give you 30 days to claim your donation refund. Consistent with the campaign finance laws, I will use any unclaimed refunds to donate to charity, a political party (guess which one!), and fund my constituent service work.