That's not really what I'm saying, though - I'm saying that selling ONLY based on offering diversity doesn't get best results. You are correct that I tend to think in terms of larger markets, and I am a traditionalist, it's true. But...if you actually take a close look at what you're doing, I think you're going to find that you're following what I outlined here, believe it or not.
Well, context is important. I've been a non-fiction writer for most of my career due to my fiction career being destroyed by the Lord of the Rings glut back around 2002. I have next to no social media presence to work with (I'm a very private person, and having to change my cell phone number due to my abuser harassing me on it while forgetting to update the double-factor authentication has permanently locked me out of any Facebook presence thanks to Facebook being, well, Facebook), and my novel concept is incredibly niche. And yet...my numbers are about average for a novel here despite these problems. So, you may see underperformance in comparison to a webcomic with a less niche concept, but I'm watching my fiction readership rebuild for the first time in 20 years, and I'm pretty damned stoked about that.
Now, onto this:
I don't doubt that it helped you find that audience. Here's the thing, though...this is your blurb:
Rekki has always dreamed of being a magical knight and giving demons the smackdown, but when Excalibur is drawn and this simple childhood wish comes true, her adult life as a celebrated monster-slaying hero throws her into a complex world of politics that tears a rift between her and her best friend.
Errant is a colourful action comic about power, responsibility, justice, love and friendship with LGBTQIA+ themes, big magical monster fights and lots of relationship drama.
So, here's the thing: you've done everything on my list. You've identified your primary selling point ("her adult life as a celebrated monster-slaying hero throws her into a complex world of politics that tears a rift between her and her best friend."), you've told us who the protagonist is ("Rekki has always dreamed of being a magical knight and giving demons the smackdown, but when Excalibur is drawn and this simple childhood wish comes true"), and your secondary selling points are clear. You outline your main themes ("Errant is a colourful action comic about power, responsibility, justice, love and friendship"), and all of this is done BEFORE you ever mention diversity issues. The reader thus knows that there's a great story to be had here, and some diverse characters on top of that.
I identified three forms of PR seppuku: Forgetting to tell the reader what the book is about, being toxic, and leading with diversity issues, and you avoided every single one. Furthermore, I said that to sell a character from a marginalized group, you have to sell the whole character, and not just their skin colour, sexuality, etc., and you do that perfectly for Rekki.
(Compare this to the recent PR for The Rings of Power, where one of the actors who plays a black elf was mainly just talking about the fact that his character was black...and we learn NOTHING else about the character: https://ew.com/tv/the-lord-of-the-rings-the-rings-of-power-cover-story/?utm_medium=social&utm_campaign=entertainmentweekly_ew%20&utm_source=twitter.com&utm_content=%20link&utm_term=20220802)
So, you might take issue with how I've worded this, and that's fine. There's plenty of people who have a knee jerk reaction to a character of colour showing up that amounts to "Black person! WOKENESS!", and they drive me crazy too - I'm a centrist...I take issues with both sides of the political spectrum. I can understand why you might be concerned. However, I do have to point out that the concepts I'm outlining are solid...and you're using them to succeed.