Since you are already working in a restaurant as an Asst. Restaurant Manager after having acquired a degree in a Hotel Management and you are having an exposure of 4 years in this line, your prospects for the job in the similar line has widened. However, you have to ensure that the degree possessed by you is a recognized one from a known university such as IGNOU, Kota -open University, Annamalai - university etc. If your degree has the recognition, your eligibility for the job is assured provided you demonstrate your potential before the Board of Interview.
Yes, you can apply for a job in the abroad on the strength of the existing qualification. Switzerland, Canada and Singapore are the ultimate destinations for getting lucrative jobs in Hotel, Industries.