Quality writing comes from quality ideas. I'll take it further -- quality ideas, even when poorly written, still outperform. The "trick" of writing on socials is to brutally edit ideas -- eliminate any low-grade concepts that aren't core idea pillars for your brand. Get to the core of what's being said. Then to hit that idea from every angle.

Posting for an extended period of time has a hidden benefit: trust building and longevity. Prospects want to know you are reliable, and posting across time shows organization, consistency, and helps ease the issues associated with bad past-agency experiences (very common).