Outlet covers no longer fit
A photo would be helpful, but from your description it sounds like you need a box extension. This extends the box so your receptacles stand proud (above) of the surface and will allow the cover to fit properly. I use these quite often after a tile job where they did not reset the boxes prior to tiling. If it is a slight setback you can loosen the receptacles and pull them to the cover if 2 screw would be ok by code, there are plastic shims that go behind the tabs on the receptacles with only 1 screw to the cover so the covers don’t break but this is for ~1/8-1/4” set back more would need an extension.