Strategy for selling a house - what is the best way to proceed?

It's too cryptic for me, sorry - I just don't think I understand what you're getting at. Or what speaks against presenting it to as large a potential group of interested parties as possible through an advertisement on a common portal to find a buyer. Most families looking for a home don't just look at the bulletin board in the daycare but also regularly check real estate portals. So where exactly is the problem?

It's too cryptic for me, sorry – I just don't think I understand what you're getting at.

Identifying and directly addressing the buying people without scatter losses among the lookers. Everyone who cannot or does not want to buy the property does not need / should not know anything about it – except those who can connect you to the competent and willing.

Or what speaks against presenting it to as large a potential audience of interested buyers as possible through an ad on a common portal to find a buyer that way.

The signal-to-noise ratio. A broadcast generates a lot of attention among non-buyers, which you don't need. Capital is a shy deer, which is rather scared off by a driven hunt (and also by every misfired shot).

Most families looking for a home don’t just look at the bulletin board in the daycare but also regularly at the real estate portals.

The bulletin board in the daycare (or also at Edeka) is a tool that I otherwise gladly recommend to use as well, but not for the homeowner change: even if potential buyers wished to find more offers there, this tool is rather (in my opinion even decisively) counterproductive for the seller. Unfortunately, real estate portals are also very ineffective: any Tom, Dick, and Harry can list something there, bad agents post bait and junk offers mixed wildly in the storefront, overall intermediary objects dominate significantly over market objects. Good agents only go there so as not to fade from visibility (because their poor colleagues are all there and otherwise it would distort the perception of potential customers). And of course because a good agent still prefers to make a deal with hitherto unknowns than none at all – sometimes all his buddies are already full. And in the portals are the objects of price potential testers, which repel searchers in various ways. All in all – but actually every single negative point on its own – the barn smell of this tool would be enough for me to gladly avoid it. Familiarize yourself with "customer avatar" and EKS.

But now you are just saying again what NOT to do. How am I supposed to get rid of the house if I don't offer it for sale anywhere on classifieds / real estate portals, or at the daycare and Edeka? How is anyone supposed to find out that it is for sale at all?

but you build yourself and smoke quite a bit? ;-)

I don’t quite understand what you want to convey. The general tone: just don’t do it in the online portal and beware of “profit”? Right!?

Why one must not sell at the price others are willing to pay doesn’t make sense to me. Everyone has to know what they’re doing. The price is set by the market. I’ve wanted a GMT for a long time, I sold mine used 10 years ago at 20% above the new price and was happy about the profit like a snow king, today they are at 500% of the new price, whoever buys it buys it at that price and shouldn’t whine about it being too expensive and immoral, if it’s too expensive for someone, they just leave it.
And buying a property is the most capitalist thing you can do, then socialism aka “oh I’m only selling to a nice young family with 2 well-behaved kids and gladly forego 100K€” — I don’t really believe that. Usually it was exactly that family who, out of sheer desperation, offered more than the others. Those who can afford to forego money have enough resources, but people who financed the thing and may have to pay even more for the new place can’t afford to sell “cheap.” And giving money away to complete strangers, no thanks. If Katharina sells the house too expensive in a bidding process to a money-laundering noise-sensitive clan board member via an online portal, well why not.

If it’s a good property, there will be a bidding war anyway, that happens automatically.

And by the way, this romantic “I select the house only to go to a young family” is also discrimination against the elderly, singles, childfree couples … not better either.

For that reason, one is almost forced to start a bidding process, nothing is more fun than facing such accusations.

A property I once sold in a quite desirable location also had these begging notes in the mailbox, with a photo of the young family, etc. None (!) of those freeloaders made an offer when it was then offered online with a broker at the market price. In the end, there were several bids at the listing price. If I had said here “you get it because you are more likeable to me than the others” …. I could have gotten into trouble. Even the last final bid was outbid by another 5000 at the last moment, which I ignored because I had already promised the buyers. They would certainly have bid even higher. I only saw the shaky financing at the notary and gulped. And yet the buyers now have a property worth 80,000 € more. If it goes wrong, they’ll come out well.

Is Kati actually selling the kitchen too? I would record kitchen and photovoltaic separately, it would have the advantage of lower property transfer tax for the buyer.

Yes, the kitchen and photovoltaic system are included in the sale. If the buyer has the cash, we can discuss whether to exclude them, not a bad idea. I think I am already accommodating the "young families" to some extent by considering marketing the house myself. This is not entirely selfless; I save money this way – but there are hardly any offers on the marketplaces that are commission-free. I'm not going to list it at the maximum price either, but as you say – I financed this property, and the value it has gained I will have to reinvest in my new property. So I really can't afford to give anything away.

Well, don't I hear the 6 sneaking out? Tuuu eesssss.