Rough em up with some sandpaper, bung em back on and go donuts everything back in again.
Rotors take longer than new pads to bed in. Go and find a big hill to drag your brakes down a few times is the absolute ideal. Failing that, ride round the block for a while dragging your brakes slightly. With a series of fast hard stops inbetween too. It’ll get you fit too, as well as bed your brakes in nicely!
A pre-emptive word to the “just go ride it” crew… Taking the time to bed your rotors and pads in properly not only results in superior performance, but also avoids the “oh crap, am I gonna stop” moments when you’re hammering down a trail and forget you’ve got new brakes. As a word of caution, I know someone who changed his brake pads just before setting off down a fast trail, went to grab handfuls of brake for a corner and almost nothing happened… A trip to A&E later and he had a full arm cast for the next 8 weeks! This is of course an extreme word of caution, but be careful if you’re riding with new pads/rotors…