Hey Slack app builders, need some help with Slack App Navigation

Hey, I need some help on navigations for a slack app, we're building( Poppins.me ) It's a productivity app on Slack and helps in converting any Slack message into an Action item or Discussion Topic. If you have built a Slack app, you will know the limited options and functionalities on Slack and we don't want to take users out of Slack. Need your HELP with how do we create an efficient Navigation system, if you built one, how did you do? are there any resources you can point at, etc? thanks in advance.