A further introduction into the various systems (i.e. trust, activity, merit, ranks) are relevant only after this.
I wouldn't mention things like trust, DT, the different type of flags, and things like that at all. That will just confuse newbies and maybe have them look for alternative sites to discuss bitcoin and crypto. For ordinary members, doing any changes with the default trust setup is something most never even do.
May I suggest to what my idea is worth, a follow-through like a test/quiz/assessment for the new users.
Like navigation, and if they have at least comprehended the welcome message.
Making users pass a quiz and testing their knowledge might be too much. That is just giving them a reason to go away even before they started. Displaying a message with the most important rules and warnings why people get banned here should be enough.
I mentioned somewhere that there should be links to the translated rules/guides as well.
That is not hard to get. You will find many members from the local communities who will help with that. Many local boards already have the rules translated in their boards. Compiling all those links in one post isn't hard. The only question is, will that ever be used or is the person doing that just wasting his time? We have been talking about the welcome message for years now and we still are.