On instagram, when you set your profile for the business suite or something like that, it will show you the option to promote your posts (each individually).
Then, you decide which is your goal, if you want more people to visit your profile, or more people to visit the link on your bio (a button to either will pop up on the post once you promote it), and then choose how much you want to spend for how much days, and your post will show up to people who are likely to follow you.
I promoted two posts, each for five days summing up for roughly $10USD, and the results were:
- 10000 views on each posts
- 190 more likes for one post
- 50 more likes on the other
- 20 or so new IG followers (from 73 to 93)
- 75 visitors to my blog where I post the links for the chapters (which 23 people actually clicked on later).
I'd say it works, but would have worked better for my comic if I had used the tapas or webtoon link.
Also, I don't know if it helped the hashtags I used for those posts.