There are methods to optimize the posts to reach your objectives.

Firstly, get your objective right. Are you planning to gain likes and followers only? Or are you trying to gain more traffic instead?

The more restriction you do to your ads, the more you are likely gonna pay. FB only charge you when you gain new likes/followers/engagement. However, do take note on the post reach. The price is determined based on the post reach taken to gain a single like/follower/engagement.

So, try to use your best photo/model/product to do the ads. When the probability of gaining likes is higher every post reach, then the cost for every like is cheaper.

I used to limit everything so that i can get quality like. But it's useless. People judge easily based on your FB page likes and reviews first before going into the details.

Make sure you post something good everyday to keep your followers alert of your product. 

Here's my baby steps to a quality FB page. Do you ads by increasing the likes and finally engagement.
Likes > Impression > Engagement > Post Reach

When you have sufficient likes, then you can reach more people in your area. Then they will start coming to you and do all the inquiry without you promoting the page likes anymore.

Hope this helps.

Mainly Indonesians that liked your post right?