Did nant y moch ( yes did spell it wrong in the vid lol ) that's a nice pretty much flat lane but great views, happy valley is bad at the top ( boggy area that you get stuck ) so didn't do it, strata is fine as long as water levels are not too high, theres lots of lanes around mid Wales and non that are too bad to do on your own.
Trailwise is a good guide if you have access.