I forgot to add: if you have your fics posted to LJ somewhere, you could, in theory, import it to AO3. I admit that the import function often didn't work for me, so I haven't tried for years, but they might have ironed out the bug in the meantime.
Nowadays I post my stuff to one of my LJ comms, otherworlds_lib, hiddenrealms or edhellondawards, since doing all the italics and bold fonts is a lot easier on LJ than hand-coding on AO3, which is a real pain in the backside, and then copy and paste the whole thing. It works like a charm.
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Nowadays I post my stuff to one of my LJ comms,
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