There are a couple of groups ride out of Monmouth including one riding on Weds eves as sheppie_hill says. One of the groups have a xc / triathalon background so may suit your riding.
As redthunder suggests, there is some more rad dude riding close by too.
I live in Monmouth and would be happy to meet up when you get down here. I know the FoD and Wye Valley pretty well, don’t mind long miles but xc racing pace is long past!
Monmouth is a great base. As well as FoD and Wye Valley you are close to Black Mountains, Brecon Beacons, Malverns, The Marches, Cotswolds, Cwm Carn, Afan Argoed / Glyncorryg, and more 😀