You might have better luck on a social media sub. Social media isn’t SEO. Additionally, organic SEO outperforms organic social drastically.
However, I would consider looking at your product or service that you’re trying to promote. If this product or service is an item that people search for – make sure your organic SEO is up to speed first. But if this is a product or service that is new you could – try social, or work on your web content and promote to similar audience.
I think running ads on social is a better use of time as compared to organically posting. I have yet to see a good social only business model that doesn’t require a ton of time on social – then when you stop posting it dies down quickly. I would love any links to case studies that show good results.