I would personally get off the platform if you are able to recuperate your costs. We don't have 100% confirmation that the microcode patches will fix the issue, as they won't be released until mid-august. May as well wait until the issue is fixed or spend your money on a platform that is more solid.

If it's still in the return window I personally would yeah

depends on your return window,

if you have a chance to refund both your CPU and mobo I'd personally recommend taking it and waiting to see what Intel does if you want to buy Intel's future processors, you'd also get the option to take a look at AMD's lineup as well

if you're outside the return window for both it might still be worth refunding the CPU and seeing if you'd be able to swap the mobo with an AMD equivalent by contacting your board maker [Asus, MSI, Asrock, Gigabyte, NZXT, etc), if they say no then you still have the option to sell as a new board as it sounds like you were on the cusp of the build phase