How is this going? I started getting serious about this today, and so far it's just been a real exercise in frustration. It seems if you have too many comments, Reddit hides the really old ones, making them quite difficult to locate.
Reddit Migration
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@earthling is having the same issue. What are you using to access reddit?
I modified the script from https://kbin.social/m/RedditMigration/t/16226/Wrote-a-script-to-edit-all-my-posts which uses the python library PRAW. Someone else pointed me to a script in python that's already using Pushshift though - I am gong to take a look since AFAICT that is the only way to get this accomplished. See https://kbin.social/m/RedditMigration/t/47320/PSA-If-you-have-more-than-1000-posts-more-than#entry-comment-202228
I feel like the only way to get everything is to use GDPR archive files. Your reddit profile doesn't show all of your comments.
Shreddit can use these files, however you have to pay $15 for the feature.
I think shreddit.com is based on someone maintaining and fixing the old python open source shreddit script on github. Both that version and the new rust shreddit support using the GDPR archive files I believe for free, you just have to run it yourself.
The issue is that I may not get my archive file untl after July 1st, at which point I'm worried that these scripts will stop working due to the API changes. Even $15 on shreddt.com may no longer be an option.
My GDPR request came back in a couple days, best to request it ASAP though.