Can We Use Facebook Ads For More Sales?

Yes with consistent efforts.

Run Facebook Ad campaign for a longer period with a good amount of daily budget for optimum results.

Short period campaigns and less budget a day would not yield satisfactory results.

Explore A/B testing in campaigns to see which ad copy or image or video or creatives, the audience are engaging more and sales are originating.

Any paid marketing campaign success is by implementation efforts consistently and learning by trial and error including good ad budget. Many pro marketers have opined this across many occasions.