From chatgpt after I gave it your comment..
The phenomenon you're describing is often referred to as "ethnic succession" or "the ladder of social mobility" in the context of racial and immigrant integration.
This process has been observed historically in the U.S., Canada, and the UK as well, with each generation gradually shifting its identity and aligning with majority cultural values, while still carrying the trauma or prejudice they once faced.
Theres a nice LawTech company in Berlin operating currently where they will take the case for you, in trying to get your rent back to market level, and in Berlin they backpay the difference.
The company Conny.De/en upon a win, take 3months of the rent per month they save you going forward (and in retrospect ).
Plenty of people with wins in my friendship group