This is exactly what I did. I saved a copy of all my content (well PDS nuked some of it and didn't save it properly, but I got what's left).
I used automated tools but I left a message on how to reach out to me at my new hangout on each one. I think it shouldn't be too hard to find the answer from there - and if it is, well hey, I'm open to answering a question or a few.
My content will be made available again, just not on reddit. reddit won't get to profit from ads using my content. Folks on reddit will have to come here (or find me elsewhere) to get that info - so i'll slowly drive em away from reddit.