I've only followed the thread sporadically... the last two pages sound a bit like you're just looking for someone to say:
"I understand, I wouldn't give up on my expectations either, keep it up, you'll find something that exactly matches your requirements."
That's really not meant in a bad way, but the reality probably looks more like this:
"Your demands regarding the location of the property are so high that it's already difficult to find anything. 1.5 years is unfortunately nothing at all. Because from finding to completing the deal to renovating, etc., more time passes. The probability of finding something in the remaining time gets smaller and smaller. So when it comes to planning, I would say, you may hope to still get lucky, but in terms of planning, either you compromise on the location or you plan not to buy a house."