Use the 80-20 Rule In Marketing

Gary Vaynerchuk’s book Jab, Jab, Jab, Right Hook explains exactly how the 80-20 marketing approach works best. You must provide useful information and build trust before you smack them asking for the sale.
If you post say 5 times per week, 4 posts should be inspirational content and sparks a conversation. The 5th post should be asking for the sale. Even then, don’t be too pushy. Work it into inspirational content.