It's basically an objective fact at this point that excessive immigration is really, really bad, just look at all the politicians flipping sides on the issue. Look at the stats on European countries with the highest immigration rates vs those with the lowest (e.g. Poland)
By what metric are you looking at european countries and determining Poland is doing the best? If given the choice between say Ireland and Poland, which place would you prefer to live?
https://www.statista.com/statistics/1541464/europe-quality-l...
https://www.visualcapitalist.com/ranked-european-countries-w...
Then maybe do something to reduce the causes if it? Recently, China has done more to reduce immigration to Europe than Europe has.