There are many companies providing the services for generate the more like to Facebook pages.But that service should be paid.If your want generate the like with out paid means,you should follow the below strategies:
Update all details of your business products and services.
Share the good thing of your business in the format of images,videos and content etc in your page
Always connecting your fans with good updates and sharing regarding your business
Recommend you business friends and people to get a likes from their circle