Looking for work authoriziation, please suggest

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Hi, I am software developer and my main platform is .net I have developed various software and worked as freelancer too, but my recent contract got expire where I used to work from home, now I have start applying everywhere but I got rejected since I don't have any work authorization, I am looking for on-site/off-shore jobs but still I get no luck, please suggest what should I do and how can I able to get get work authorization.