you could share your books uploading them to libgen. I mean, they are probably already there but in an annoying PDF format. Not everyone has the knowledge to convert a PDF to an epub with good formatting.
I would like to do something like that but I don’t want to be scrutinized about technically being a bootleg publisher.
The books I did it to are from small authors writing for niche communities and I don’t want to make it easier to pirate than buy in that case. Anyone else can find those same PDFs on a website easy to search and well recommended by the community so the information is available, and if they want an ePub they can format it themselves or just buy the version from Amazon and support the author.