How's your LinkedIn? Maybe start by asking old collegues for testimonials. I never done that myself until for my last job. I thought to myself "you never know" and it's better to have something there.

Do you write a blog? Then you might want to start. I regularly get featured in newsletters and I would say plenty of people "know me" now in the community. Sometimes I get a job offer too.

As for X posts, maybe you haven't reached a critical number of followers or you simply need to change what/how you tweet. Experiment more.