So essentially, just accept that your culture, whatever the hell it is, is going to change, whether there is immigration, or no immigration. Accept it, and do whatever is possible to make the most out of the resources available to improve quality of life, but know, that if there isn't a broad economic incentive to do something, it won't be done, no matter how much you might wish for it. The only reason there is so much current conversation around immigration now, is that it is being incentivised by those who benefit financially from it. It has an economic incentive.
There's an economic incentive for proper migration. There are those who benefit from it. Syrian migrants have arrived in Türkiye due to the war in the last 10 years. Turkey has received a substantial sum of money from Europe in return. At the same time, employers have hired workers cheaply. Migrants have performed harsh and inhumane labor. This definitely has a significant economic connection.