Nobody says No to some extra Cash. As an expat and with a work visa, you’re typically restricted to one employer.
It’s best to check your individual situation with your employer and/or seek legal advice.
As follows some options on what passive income streams you could start:
1) Stock Investment
2) Real Estate Investment
3) Temporary, non frequent rentals such as AirBnb or Turo.
4) Referrals, e.g. bank, investment platform, credit card