Depends, if you want to dig ‘officially’ you can join the DTV dig days. They are mostly maintaining the existing official trail network. I think they dig at weekends usually, but I’ve never been involved to be honest.
Unofficially, well, it’s mostly locals & dig groups are just a bunch of friends out doing things they probably shouldn’t be.
As someone who does dig in a group who are probably a bit selective with what we do & where. I would say if you want to go out & do maintenance to off-piste stuff, crack on, if you’re just fixing up berms, braking bumps, re-benching stuff then you will always get a thumbs up from the builders 🙂