I'm a big fan of cyclOSM bike maps, that I use in OSMAnd.
Now I wanted to try Locus.
Bur how do I use cyclOSM maps in Locus. As far as I know I need to import a XML file.
But with which content?
Locus uses Openstreetmap data by default, what parts of CyclOSM and OSMAnd do you like? If you want to plan and import a route you probably want to export and then import a GPX file.
To add the CyclOSM map tiles as a layer, you do need to follow the instructions here
Unfortunately I don't have the free time/energy but the links are written tutorials on how to set it up in Locus, you just have to follow each step and research any steps you don't understand.