Anywhere with proper tagging system and folders function is not a problem.

Let me tell you: If FA is able to stick around in a more-or-less functional state through all of what it’s going through, that will be the best case scenario for me in that I’ll then be able to keep all my writing up for others (I’m telling myself my writing has benefited others and will continue to do so) without ever again having to look at any of it myself.

Maybe you can try actual story site, like archiveofourown. (I don't know if there are any similar sites. But it can hold original works anyway.)

You know what? I absolutely should do exactly that. It's frankly just a matter of working up the nerve to go back over these old stories (see: "I’ve become increasingly uncomfortable with repackaging my own untreated gender dysphoria into jerk-off material as I’ve come to terms with just how badly my gender dysphoria has impacted my mental health") then.