You built a career in a country
that isn't yours, and that shapes
every option in front of you
Your right to stay may be tied to an employer. Your professional network here started from zero. You work in a language that is not your first, and the rules you grew up with do not apply.
None of that stops you building something of your own. It does change which risks you can take, how fast you can move, and what has to be in place before you start.
Almost no advice on building a business is written with any of this in mind.

