You can also edit your discobot user to make it look more like a staff or system message, as you see fit.
I liked Nolo’s guide to leverage the trust level notifications for this - nice job! But it does depend on your users being promoted to trust level 1 to get their first welcome message.
One other thought that comes to mind is that you can also write a welcome topic and bannerize it, so users see it when they first log in. This gives them an opportunity to read it and dismiss it when they are done, and then jump right into discussions! You can link it to your FAQ which will always be on the menu for those learners who like to read lists of instructions. Here’s an example of how this might look: https://community.namati.org/t/faq-frequently-asked-questions/1467
Also, the contents of the welcome message with tips will hopefully become less relevant in the not too distant future, when we implement more just in time education popups to help new users to learn about new features they are encountering as they move about your forum.
And finally, all of the above is very oriented around getting your users to learn their way around Discourse. You may also like to set up a newsletter or way to mail your users directly once they sign up so you can communicate with them by email outside your forum about opportunities to engage in your community.