I guess what you call "organic", I call the very end of the tail of a "pump". I believe that Reddit sentiment is largely manipulated. When GME was going crazy, there was definitely a coordinated effort to pump AMC, BB and some other garbage that I forget.
I don't believe that suddenly a group of people will all randomly pick the same tickers to start hyping up. I'm not saying everyone involved is trying to pump/dump those stocks, I think it's a small group of people posting bullshit analysis in random places trying to get other people to buy + hype up the stock to create that "organic" interest that you are capturing.
I reckon BBBY was definitely an organized pump and dump for example, but only a small amount of threads/comments were organized. A lot of people buy into the hype and continue to hype it up themselves.
The most interesting part is identifying which stocks will end up "going" viral, by analyzing who/when/how the first mention of these tickers starts up. Maybe a certain writing style works really well, maybe if some ticker gets mentioned at the same time in 3 specific discord channels then that stock goes on to do well. Maybe if a certain reddit account posts it first it goes well, etc.
Using PRAW to get counts of ticker mentions in some subreddits isn't super interesting, at least in my eyes.