How to deal with increasing property tax burden?

Here 600 to 950. Both the measured amount and the assessment rate have increased.

I would also be a fan of going purely by property value. Polemically: This way, retirees in good locations and depreciated houses are relieved, and young taxpayers and pension payers with new or renovated houses are burdened.

I once read that if an increase exceeds 40%, one should take legal action. At least there is supposed to be a model case that has confirmed the limit of reasonableness.

Property tax assessment notice comes from the tax office.

That's exactly right.
In my case, the tax office calls it "Notice of property tax equivalence amounts main assessment as of 1.1.2022"

from the municipality then "Tax notice 2025"

I assume that here it's more likely the people who report where it has become more expensive.

For that, the purchase price was different, reflecting your surroundings.

In fact, we were extremely lucky with the purchase price, and it was significantly below what was typical in the area. Now it has risen, but if one were fair, it would still have to be quite a bit higher. We live right in the city by the forest, all the daily madness facilities within walking distance. Only the main road running past us is no jewel now, and the railway line on my property. Similar plots at the other end of the city have double the value. So it really doesn't make much sense.

So either it is buildable or not allowed. How should both work? Did you file an objection?

With us, there is a distinction between whether it is buildable (meaning it could become building land if one wanted) and whether it is official building land.
I could go to the office and officially make building land out of my entire property. But according to the land register, the rear strip is garden land. So no "buildable land." I don't know if it is handled this way everywhere.
The funny thing was, when I called about it last week, they themselves were totally confused about why it was accounted for that way here. The left hand doesn't know what the right hand is doing.

We have now received the official notification. We are now paying €159 per year, previously it was €176.

It was foreseeable. Those who have been gouged over the years with larger houses (over 220m2 according to the Sachwertverfahren) or who have new houses will be somewhat relieved. Those with very old houses are now paying more. It's only fair. It should only depend on the land and not on what stands on it. If we even need a property tax at all. And let's be honest. Because of 2-300 € more or less property tax, nothing should be at risk. Otherwise, it's just a house of cards...