Following the developer here on Itch should be sufficient -- I see game updates all the time in my Feed. But like veridis said, social media outside of Itch is important too. Instagram is good if you have good screenshots, gifs or video to share.
If you're a first time developer, I think it's important to have frequent devlog updates -- you have yet to prove that you can actually finish a game. But once you've made a couple, then you can have month-long gaps between updates because your player base will trust that you'll bring the game to completion.