It's a lovely house @Swx, although I don't think the photos do it justice.
I vaguely know the area as for six years we lived not too far away (in Derwydd, next door-but-one to the mansion) till we sold and moved home to England last September.
I can see from the historic details that you have hugely improved the house from when you purchased. So the price you're asking now doesn't seem too ridiculous, although some people won't see it that way/will want to make their own improvements/won't want to pay for someone else's choices!
We also bought ours in 2018 (February) when we paid 160k as a repossession. It was an old mill - detached with just two beds in 0.5 acre of garden - in need of complete renovation. The previous owners paid 232k in 2006 iirc, so we got it for a steal, although it really was in a terrible state (eg, rain gushing through the extension roof!).
We totally transformed it - as you seem to have done with yours - over the six and a half years we owned it and put it on the market in late 2023 for 450k. One EA valued it at 500k which we found ludicrous!
It took us two months to get our first two viewings (neither proceedable, although one made a derisory offer) and a price drop to 425k before we had a 'flurry' (EA's term!) of viewings and a couple more offers at 400k in May 2024.
We accepted one of those and - after a few septic tank issues - sale went through at 390k last September.
Our location was arguably better than yours (peaceful backwater, although further from amenities/neighbours), but after the pandemic rush for rural properties, things had slowed and were taking longer to shift. I imagine in the current stagnant market it would take longer now. I think the road will definitely be deterring some potential buyers and I guess you might have to drop to 350k to reflect that/accept an offer between 330-340k.
Regarding your listing, I think the photos could definitely be better - we chose John Francis as they used a professional photographer and their floor plans had room dimensions which is a plus as I hate having to keep flipping between description and floor plan when I'm looking.
I also want to know the overall square meterage/footage which I'm struggling to find on your listing.
I've never come across your EA - I'm guessing they're a small local one? We preferred to go with a larger EA who had contacts outside of the area as we guessed (rightly as it happened) that our buyers wouldn't be local.
I think you just need to be patient - it's hard, I know - and I agree that several quick price drops is not advisable.
Personally, I'd remove it from the market till September now, then change EA and remarket at 350k. Good luck!