The only real way to get more likes and followers is to earn them by having good posts. Post every day about things that a wide range of people find interesting and use hashtags often.

For increase facebook like you can use addmefast website.

like exchange services is best for imcreasing likes,but Facebook policy has been changed, you should put advertisement

if you have the cash to spend, I think facebook ads is still the best to increase likes.

When you will post interesting post on your facebook page then share that post on your groups you need to make good groups on facebook platform from that people will reach to your interesting post and from there your facebook likes as well as sales will increase.

Post attractive massage on facebook and increase your facebook likes.