OP I hope you don’t mind but I’m following this thread for when I finally write the book I’ve meant to write all my life 🤣
I have zero experience of this as a writer but it’s an area I’m interested in. I reckon you have nothing to lose by self publishing as long as it doesn’t cost you a fortune to do so (I would presume this is not so much if you keep it to e-books initially depending on your genre - maybe not so great for eg art or cooking or young children’s books).
I am an avid reader though and always have been, so can tell you my advice from that point of view. I would previously have turned up my nose at reading self-published books but over the past decade or so I can see that publishing has changed massively and to me agents seem to unfortunately largely be supporting already very successful authors or celebrities or other very “safe bets”, making it much harder for ordinary people to get a look-in with traditional publishing routes. I’ve read some great self-published books although unfortunately some drivel and poorly edited rubbish that also exists. I would definitely make sure it is well edited before publishing it. I literally don’t read past the first few pages if a book is riddled with spelling and grammar mistakes, I just can’t stand it! I stuck with one longer once because it actually had a good story but it was just so distracting and off putting I gave up about 2/3 through.
I can see that some authors (including some I now love, Jodi Taylor for one) have done exceptionally well using this route (at least to begin with, she has an agent now). So it’s clearly possible. I think a good product is half the battle but I agree marketing is going to be important too. I tend to be more likely to read self-published books if they come up on my kindle recommendation algorithm, especially if they are on kindle unlimited (because I can try it for “free” and abandon it if it’s drivel), or possibly I might be willing to take a risk on one that sounds good for 99p or at most £1.99 (if it’s good then I’m more than happy to pay full whack for later works). I found Jodi Taylor’s first novel, which was self published and super successful (even though as much as I love her she is clearly a bit of a dinosaur when it comes to modern technology 🤣) on kindle unlimited for free download and I have now read every single bit of her prolific output! I honestly believe her that she didn’t particularly set out to become so commercially successful, she is clearly an amazing writer and not at all stupid but I don’t think her success came because she was aware of all the marketing tricks at an early stage of things but rather in spite of it, though her agent pushed things onto another level once she had initial success). Have a read of this article she wrote at still a fairly early stage of things explaining how she got to where she was then (long since surpassed!) She comments that she thinks lots of people were downloading summer holiday reading by coincidence at the time and indeed that’s exactly what I was doing.
https://jerichowriters.com/jodi-taylors-path-to-publication/
In more traditional genres I’m probably still more likely to stick to more traditionally published books (such as psychological thrillers etc) but for sci fi/fantasy/comedy/litRPG stuff, all of which I also enjoy, I’m more likely to find what I’m looking for in an author who self-published at least initially. But I’ll give it a whirl for minimal financial outlay in any genre if I hear about it and the blurb sounds good, especially if it also has good reviews that aren’t clearly written by family and friends or paid bots.
Facebook advertises me books all the time and I quite often click on these and end up buying them. I’m also a member of some fan sites on Facebook, for specific authors like Jodi Taylor, and there is always lots of chat on those sites about similar genres books that other people are enjoying, but also some more generalised groups (for example for litRPG books in general), which is also a great place to find out about new self published books I might like. I know a lot of authors on there have initially gained a following by publishing serialised bits of the story on sites like watt pad and Royal Road, but I have to say I personally don’t use those because staring at screens for too long hurts my eyes (unless it’s a kindle paperwhite which feels like reading paper not a screen).