Afan isn’t much further than Cwmcarn, neither is the FoD, especially when you don’t pay for fuel ;)
I really want to get to Brechfa this year but that’s a bit of a drive for a days riding.
The Quantocks are great but as already said, a guide is essential to get the best out of it.
I’m planning in digging my bike out again soon, I’ve not ridden over the last few months for various reasons.