so the bike shop is a best choice... second option is to take pics of the hub with the cassette removed, then post them here, hoping someone recognizes the hub...

freehubs are not universal parts, and they are certainly not "standardized' in any way...many will only work on their specific hub assembly.

Contacting Cube may be helpful too... they may have specific Hub brand/model info for you, and may even offer a replacement freehub... but don't get your hopes up.

what is your best description of the problem? do you own a proper cassette remover socket and chain whip tool?
freehubs are sometimes mounted to the hub body by a large 12 point internal drive "bolt"... 12 or 14mm allen wrenches are used to remove many of them... others are "swedged" together, and are not serviceable...
i see that your hub is a thru-axle design... is it micro- spline, or Shimano Hyperglide, in regard to the freehub?
SRAM has a couple different configs too...

still thinking taking it to a shop will be the best choice here... lots of possible stumbling blocks, dozens of optional configurations to weed through...