Why does engagement drop even when posting regularly in social media ?

I am a business owner, and I have been consistently posting on social media for months, following a regular content schedule and trying to stay active across platforms. I share updates about my services, post images and videos, and even spend time creating content that I believe my audience would find useful. However, despite all this effort, I am not seeing much growth in followers, engagement, or inquiries. My posts are getting very limited likes, comments, and reach, and it feels like my social media presence is not growing the way I expected. I want to understand why engagement drops or stays low even when posting regularly on social media, and what I might be missing in my strategy as a business owner.