hi

if your passport is not stamped with your RP, you are free to change without any fear, only thing is that you may loose your settlement payments, but you must get a job, with a company who have visa for you, you can always go out and come back with a new business visa provided by the new company.

please check out visa availability as Qatar is strict about visa for a few country nationals,

With Best Regards and thanks

Jaideep Pandey