I don’t know anything about Miracast but it appears to work with WI-FI only. If your blue tooth isn’t working on your laptop that is indicative of a problem that might bleed over to WI-FI. I would do a blue tooth reset on the laptop. Try to fix the problem you can first identify.
Bluetooth on the laptop just literally disappeared. I can find nothing in settings or anywhere else that indicates anything to reset, or any other indication it exists... anymore.
WiFi itself on the laptop works fine. Except with Miracast.