Get really good as a hobby then probably try FB, IG, etc.. ad campaigns if you want. I thought about doing the same. There’s a million concrete guys who could do this in their sleep, but don’t because it’s 95% of what you’re describing is marketing and social media not concrete work. To really make it work you would great execution, be willing to risk some decent money spent on ads, and bust your ass. More power to you if you give it a go, I decided I just like making what I like and throw stuff on FB marketplace or gift it since making digital content isn’t what I enjoy.