I still have to use Reddit for some super niche communities to get answers to questions. Some of those communities don't exist on Lemmy or have far too little people on Lemmy to get any answers when I am looking for an answer within the week.
There are some subreddits for older games that I also use to ask some questions. I am not going to make a community on Lemmy for a game from like 2011 or 2015 to just ask a question about the game mechanics or something.
Also, Reddit still has a lot of good info from a lot of communities to still go back and reference. I still use site:reddit.com
in a search engine a lot.
I don't go on Reddit to comment on other people's posts anymore though.