There are a few countries who compete for residents. For example, The Netherlands has a 30% tax advantage for all immigrants, for 5 years. Thats huuuuuge . [1]: https://www.iamsterdam.com/en/live-work-study/living/officia...
Interestingly you can apparently, if you're careful about it, register your own foreign company there and avail of the 30% ruling so long as you register your company before you move. I have an Irish limited company and am working on figuring out how to do that so I can move to NL and avail of this tax benefit.