Best workflow to prepare stems for mixing in Cubase elements

I’d like to send a song to external mixing and mastering.
I use Cubase elements 11/12, which do not have batch export.

I’ve already mixed the song myself, but obviously I need to turn off the extra (not essential) effects.
I’ve saved the project file under a new name and turned off all inserts, channel, eq, and sends.

What is the best way of proceeding? Should I just solo each track and then “Audio mixdown” it?
What about mono/stereo tracks? Is there an easy way to route each track.