I go to Aberdovey every year for a week with the wife’s family and manage a couple of days out on the bike. ClimachX is obviously the nearest trail – I believe since the felling the trail is all still there but the character has changed somewhat without the trees.
Trail centre wise Nant Y Arian is next nearest and is great. If you have enough time then do the beast at CYB (miss out the north-east fire road loop ).
Personally this year I’m looking forward to hopefully getting to Antur Stiniog as it’s just over an hour away and seems to be getting rave reviews.
Natural riding wise there are the Mach trails – I didn’t really rate them when I did them a few years ago, they have since been re-routed though. There’s also Cadar Idris nearby and even Snowden.