Hey, I honestly feel the scope in India is very high for AWS Admin compared to Salesforce admin. The thing with Salesforce admin is that companies that use Salesforce require people to handle Salesforce and its resources which shouldn't by anybody's long term plan. Salesforce admin on its own does not have very good growth. But on a positive side, there are really high chances of getting a good business analyst role.
Talking about work experience, I think a year's work experience is enough. The important factor would be getting the certification and clearing the Salesforce and AWS exams. So start preparing for those.