Stop using Facebook's Boost a Post feature. It optimizes for engagement, not sales, by showing your ad to people likely to like it rather than buy from you. Use conversion-oriented ads instead to target actual buyers.
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If there was one piece of Facebook ad knowledge that I could just magically airdrop you right now from my brain to yours, it would be this: stop using the boost a post function. When you hit that sexy boost a post button, what happens is that you're asking Facebook to show your ads to the wrong people. In other words, people that are engaging, commenting, sharing, liking, and all of that good stuff. But you don't need more engagement. You need more sales. You need more buyers. You need more customers coming through the door. So that's why I never recommend you use the boost a post function. Instead, learn to run effective effective Facebook ads using conversion ads. If you want to learn how to do this for yourself or for other people, make sure that you follow.