Just write what you feel like, I didn't know whether I had the confidence to start writing in programming and full stack , and had no idea what kind of reception I would get back but its sure been worth it. I know I didn't expect over 100 followers. As long as you find the confidence to inspire others, you'll get in a pattern of doing it and can also increase your career by writing about your experiences.
Yes, in-poster syndrome, for one thing I have felt it as a Full Stack Developer not just due to my knowledge but personally and traits and luckily enough for me i'm also a unicorn so I absorb information straight away to a degree.
When I write, I try and go for every two weeks roughly depending on the time I have or an experience. I've been writing one recently with the experiences about Ubuntu and different versions of Linux which I'll be posting shortly.
I remember watching Lady Gagas documentary, and even at the end of the documentary she even states to her self, even though shes the queen of pop, she doesn't feel like its real or that she will ever be good enough and i'm sure we all have this to a degree, be confident, know the tech you're talking about and soon enough you'll get followers in no time :)