Invite your friends to like page and share page link on multiple groups.
Do regular updation on facebook. Post user friendly information.
share relevant information, invite people to like your page share your page post in various groups & community. Ask people to share your page on a wall post. These are the methods for increasing like on facebook page.
You just have to post those things which Facebook users likes a lot and try to increase your friends circle.
Post an Informative post with good Quality Content that user want to Read. Use good Quality Images and more that will improve your organic likes on Facebook.
Good, original and quality content and regular posting is the only way to get more likes for your FB page.