Best country too move too that is very pro migration, for the long term ?

I am in my mid-ish thirties, and I run a niche precision engineering equipment company. I currently live in Germany where we have our main base but we have another factory in the North East of the US.

I am originally from the Balkans.

I have become rather bored of Germany and I am looking too relocate myself and in the long term part of the business too a new country.

The long term prospects in Germany scare me off with the political instability, declining birthrate, strangling of invotation of certain fields both by lack of funding and regulations, combined with the sad, simple and negative populist rethoric towards immigration.

Sadly this backwards attitude towards immigration seems too be infecting much of the world with its simplistic and backwards anti immigration attitudes (too be clear I am not saying that there should be 0 restrictions).

Are there any devolped and promising nations with both positive attitudes towards immigration and immigration friendly government policy which will likely continue for the long term ? (Yes, I am well aware that the future cannot be completely predicted).

I enjoy sports including football and boxing, good nightlife, big cities, rock climbing, science and engineering (my background is in mechanical engineering engineering). Weather is not really a factor.

I am single and never looking too have kids.

Thank you