AhsanaAllāhu 'alaykum. What is the advice to those who have big worldy aspirations and seeking financial 'freedom', knowing that they live in a non-Muslim country that will expose them to free-mixing, improper hijab (due to discrimination)

Seeking wealth is praiseworthy when it is sought to obey Allah, and blameworthy when it is loved for itself and put before the Hereafter, as Imam Ibn Baz said. Shaykh Ibn Uthaymin said living in a non-Muslim land is allowed only for one safe in his religion and able to practise it openly. Hijab is obligatory there as here, and a woman may not work mixed with men. You will never leave something for Allah except that He gives you better (its chain graded ṣaḥīḥ by al-Albānī raḥimahullāh).