Marketing is very tedious in today's Internet. Most people spend their time in walled gardens with very strict rules. For example, you cannot just go to Reddit, find the relevant subreddits and post your work there. No matter what you are marketing or how you do it. You have to be "part" of a subreddit's "community" (=suck everyone's dick) for weeks before they allow you to make even a single post about your work there. Even then you are fighting an opaque algorithm box and it just randomly might shadowban your posts.
This is why the influencer economy is so valuable. Going through these people is one of the few ways to actually make people aware of things existing.
This site used to be better, but here are some idea's that might be valuable:
https://draft.dev/learn/marketing-checklist