As you’ve already been looking for a long time, maybe you need to accept that house buying is not always love at first sight, and there are compromises to be made. Our purchase fell through due to our sellers, but we sold to our buyer and moved into rented.
I looked round hundreds of houses and the more I looked, the pickier I got - I wanted all the ‘nice bits’ of various houses but nothing ticked every box. Being in rented was expensive and frustrating in a rising market - in the end I saw a house which definitely had compromises, but which had some pluses - it was detached and in a nice location. We went for it, knowing it was a practical house and we knew we could sell it if we wanted to in a couple of years. I hated in when we first got the keys.
Now, four years later, I wouldn’t be anywhere else, I love it. It’s near the train station so the teens are independent, we have expansive green land within walking distance. We did a garage conversion and put down new carpet, we bought new furniture and we love the fact that area is quiet and our neighbours are friendly.
I have no idea which direction the garden faces, but I’m saying that the more you look, the further away ‘The One’ becomes. Location is everything, buying the worst house in the best area is miles better than the other way round.
Be realistic about the alternative possibilities, if you definitely think you can do better then pull out - but second thoughts are normal. I’m assuming you will have made a stamp duty saving in the interim period, so practically if you move and hate it, you could move again without it costing more than you were originally expecting.