Making character sheets then share it in your socials and communities.
Make memes, vines, participate in challenges, DTIYS, trends with your characters
Share concept art, share some assets like designs of accessories or backgrounds
Share the making process of the comic, be it pages, design of a character, a panel, etc. Can be either via reel, speedpaint, irl time video, streaming, etc.
Engage with other creators and get your characters to engage with theirs, roleplay them a bit, and such.
Those are a bit to put an example