Consider instead editing all of your comments so that they link to one of the threads about the blackouts and say that you moved over to Lemmy, with a link to a Lemmy instance and something explaining the Fediverse.

You can use Power Delete Suite to mass edit your comments. I personally used the pkolyvas fork which adds a 5 secs timer to comply with new API rates (but then it's very long so you have to keep it running for a few hours).

For example this is how most of my comments now look like:

(don't copy the same text otherwise you're just helping Reddit justify undoing the edits by considering them spam)