question: what is the most developed modern islamic country that does not have that much fitnah in the sense of immorality, ( dressing of girls ) and the one who goes there can practise his/her religion freely without much dangers, and is in the hands of muslims, and that is suitable for hijrah and a person who was living in a very modernized country can move there and live there without that much difficulties?
If you are looking for 'comfort' with some Islam in the background, then probably any oil-rich Arab countries. But these countries will have lots of immoralities (e.g., Dubai has beaches where you would think you are in the West).
If you are looking for both 'comfort' and a strong Islamic presence (little immorality), then only in your dreams. The strongest believers and best Islamic places are being tried the most in this Dunya because Allah (ﷻ) wishes to give them more in the Akhirah, which countries like the rich gulf countries cannot match by even 1%.