I believe everything is still there going back to earlier than 2014. Try typing your user name into the search bar. Once you run a search, the results window has a bunch of filters that you can use to narrow it down (like searching specifically for users).
In some cases, if the old account was deleted, the posts show up as Anonymous. If that’s the case, you might have to try searching for some other keyword if you can think of one. Your name may still get a hit in cases where people replied to you (those reply tags keep the name that was in use at the time).
DK2, CV1, Go, Quest, Quest 2, Quest 3.