Here are what the portals say:
Bank of England inflation calculator: 372,896
Zoopla: low 297 medium 312 high 328
Houseprices.io: 284,250
Nationwide: 284,250
It's not often I see Houseprices and Nationwide agree to the penny, so they must both be taking in a lot of local sold data.
The agent you have listed it with has had to reduce the price on around 50% of their 43 listings in the 200-400k market. I would say they either don't know what people are prepared to pay these days, or they're overpricing in order to get you to sign a contract.
I can see you've changed the flooring, but what other upgrades have you made since 2018? Tangible ones, such as new windows, things being extended etc. Not just decor choices.
Houseprices.io also suggests that you overpaid in 'real' terms by 10.6% in 2018 (that's an inflation adjusted figure) 25k. I quite often see houses that went for more than they should have years ago sit on the market for a long time. The last two to sell in your postcode at a profit were both sold in 2020 and 2021, when everyone was overpaying after people could finally look at houses after covid. Other than that, the last three that have sold made a 'real' loss.
In fact, looking at the colour coding on io, I can time whether people are prepared to overpay for your area or not literally in sequence with finances at the time
2009 to 2015
Almost all red or orange: this fits the exact patterns I've seen elsewhere after the 2008 financial crash
2015 (later) to 2018
Green
2020 and 2021 - people had saved up a load of money not being able to go out during covid so had more for deposits, and then there was a stamp duty holiday
Green
2022 to 2024 (expensive mortgages)
Back to orange again
2025
Stamp duty back to normal levels again.