The first thing I'd recommend is to do a search in Rightmove of your postcode, half a mile out, and check the "BUY" properties with STC (you need to toggle this on) and also the "SOLD" properties for the last 6 months (different tab menu at the top). That will give you a very good idea of what is selling, how is being marketed, how it is presented, what the price range might be, etc. If you also look at the last month or two and check when they were listed, you can get an idea of how long it's taking to sell, whether any sold within weeks and what they had that you don't, etc
You probably have already addressed most of the comments so far but as someone right in the middle of selling and buying, I have been looking at lots of listings lately and these would be my thoughts:
When I first looked at the listing, I thought you had no bath and I was about to close the app to mention this when I noticed the pic with it. Can you move that pic towards the first lot and before you show all the other shower rooms?
The first lot of pictures gives a cold/sanitised look that's uninviting. The second lot gives a cluttered look that's also uninviting. Neither would put me off completely from arranging a viewing if I were wanting to move into the area and there were not many choices. But if there are other properties that are better presented and I had limited time to do viewings, I would go see those other ones first and might end up not seeing yours. I would get a door for that wardrobe with clothes and teddies, that's what I did with my son's because it was a similar situation. It just gives the impression that there's not enough storage, same with the TV so high on that shelving unit. The house is a good size but it's not coming across that way in the pictures. People looking at the bedrooms might not be thinking about how they could enjoy that space but about how to reorganise and get storage or put things away, which is not what will get you a viewing. In the living areas, I have the opposite impression, it's so neat and clear that I don't picture a family enjoying the space. Of course that I can imagine it, but it's not giving me those vibes and my gut is not telling me to arrange a viewing because I want to see myself in it. That's what you might need, to present it so people see themselves enjoying that space and minimise the mental lists of things they want to change or clear out. Now, most people can see through. But if there are other properties getting the viewings because they are presented just that extra bit better, it might mean that the buyers are not checking yours because they are busy checking first those other ones and maybe putting an offer somewhere else before they go to yours. The house we bought had that issue. It had been there for a while when others were selling, but the pictures were uninviting and it wasn't getting viewings. Good for us, I guess, as we could see through them, but the seller was puzzled.
I would simplify the kids rooms for the pics (just move most teddies away), remove clutter, make the beds to look a bit more inviting (i.e. look at how shops and house magazines present them, pillows and cushions on top, only one throw if any, etc), add some warming touches to the common living spaces such as plants, rugs, lamps, etc. Taking it even much further if you can, for those who cannot imagine themselves in the space at all, maybe have a couple of nice wine glasses or fancy coffee mugs on a tray, fruit bowl with fresh arranged fruit more visible, a couple of stacked nice books, some chess or board game that looks nice, sun chairs outside or little table and chairs with summery cushions, etc. I did most of that with mine, except the wine/coffee glasses, but I removed all the counter top appliances and only left the kettle and the espresso machine, to draw attention to that. I'm not saying make it Instagramable, but definitely "present a moment" with each room, be it relaxing at night, family games, reading in bed, movie night, working from home, etc. Try to think what's the best about that room and present it around that, remove the rest for the picture. It's worth the extra couple of hours it takes.