I agree that (whilst it's not my style of property, we always buy characterful, old houses) it's a fairly decent house once you get past the ugly frontage (and I can't talk, having recently purchased a Georgian cottage with butt-ugly integral garage door along the coast in West Sussex!).
However, internally there's mostly a sea of bland, clinical white with nothing to make a potential buyer feel they have to buy it! A feature such as that parquet should be emphasised (I can't see any reference to it in @BraOffPjsOn's listing - which tbh, is fairly basic without so much as a room-by-room description) as a desirable feature of the property. You can - just about - make out the parquet in some of the photos (mostly the dining area ones), but it deserves a mention as many buyers would see this as a starting point for an amazing mid-century decorating scheme! It's a shame the OP didn't take that cue and run with it imo.
Otherwise it's mainly down to price as always...although - and I appreciate things are vastly different to 2024 when we last sold - I disagree with the comment that you can't expect a significant increase in price over a relatively short time frame. We renovated a period house in rural Wales where properties were notoriously hard to shift even then (a few years previously during covid was a very different matter) and succeeded in selling for an increase of 230k over and above the price we'd paid six years earlier. One thing we ensured, however, was that our house stood out from the competition - it was featured in the local online paper, described as 'magical', which I have to admit it was.
I think the OP should replace the large sofa with something smaller that has a more mid-century vibe and lean into that look with a bit of strategically placed, inexpensive art. Lose the storage boxes/clutter and have the photos re-taken on a sunny day...plus get a far better description written up where features like the parquet are spelled out to prospective buyers. Even if you have to write this yourself - we've done this several times as even the best EAs sometimes write appalling descriptions!
Good luck!