Welcome to Fosstodon. Things are slow at first but as you find people with similar interests and follow them, others will follow you. Create your bio, add an avatar pic and some emojis to your name so others can learn more about you. If you haven't, sending out an introduction listing your interests will help.
The custom emoji list is here:
Also see Kev's most awesome blogpost about getting started here:
Good luck and have fun.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.