If you want to go to Reaper, there is a painless way using azslow's plugin called reacwp it works pretty good for me for Audio only projects. All you do once reacwp is installed as a Reaper plugin, is open the .cwp in Reaper and save the Reaper project to wherever.
I did discover that Cakewalk Instrument tracks have a wonky result from reacwp, so a quick fix is to move the MIDI to a MIDI track and routing that MIDI to the Instrument track which is extremely helpful before opening the .cwp file in Reaper.
YMMV