Most of the posts I made on Facebook/LinkedIn/Instagram aren't reaching the right audience (or sometimes no audience at all). This was all due to millions of posts per day probably spammed or shitposted by someone who wanted to have some fun.
I'd recommend trying less popular platforms like Mastodon, LinkedIn Articles, substack, Cofounders Lab, Tumblr, ProductHunt Discussions etc. Although we would have less viewers but the chances of your post getting viewed would be higher.