Free is not the same as Public Domain.
If you want everyone to have it free, without limitation, forever, you can state on the "copyright" page that it's not any longer copyright but placed in the Public Domain. Then you can upload it to Gutenberg.org and the library here.
Gutenberg is the most popular source of PD ebooks since even before websites and ereaders. The Internet pre-dates websites and before that there was dialup direct to servers.
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