If you read people's posts and comment with relevance and interest they will comment back. I'd they don't comment back just ignore them and their posts and move on to find others who do.
By doing this, you will begin to build relationships with those who are interested in you and open to relationships. Of course, you need to have great posts of your own for them to come and see.
Again, I say thank you. This is like a mentoring lesson to me. I will make sure to keep to everything you said.